modelsearch not working in yii2

I have some problems in making modelsearch in yii2.

Here's is my table's relation

I want to display Jurusan from table aitambah to ais3 and I want to display NamaMahasiswa from table ai to ais3. I made table s3penghubung so that table aitambah can be related to ais3. I was able to display them. But, when I try to type "71501" in "NRP" field, the searching not working properly.

here is my modelsearch codes:

<?php

namespace app\models;

use Yii;
use yii\base\Model;
use yii\data\ActiveDataProvider;
use app\models\Ais3;

/**
 * Ais3Search represents the model behind the search form about `app\models\Ais3`.
 */
class Ais3Search extends Ais3
{
    /**
     * @inheritdoc
     */
    public function rules()
    {
        return [
            [['id', 'kode'], 'integer'],
            [['NRP', 'namaMahasiswaText', 'ProgramStudi', 'TanggalMasuk', 'TanggalKeluar'], 'safe'],
        ];
    }

    public $NamaMahasiswa;
    public $namaMahasiswaText;


    /**
     * @inheritdoc
     */
    public function scenarios()
    {
        // bypass scenarios() implementation in the parent class
        return Model::scenarios();
    }

    /**
     * Creates data provider instance with search query applied
     *
     * @param array $params
     *
     * @return ActiveDataProvider
     */
    public function search($params)
    {
        $query = Ais3::find();
        $query->joinWith('ai');

        // add conditions that should always apply here

        $dataProvider = new ActiveDataProvider([
            'query' => $query,
        ]);

        $this->load($params);

        if (!$this->validate()) {
            // uncomment the following line if you do not want to return any records when validation fails
            // $query->where('0=1');
            return $dataProvider;
        }

        // grid filtering conditions
        $query->andFilterWhere([
            'id' => $this->id,
            'kode' => $this->kode,
        ]);

        $query->andFilterWhere(['like', 'ais3.NRP', $this->NRP])
            ->andFilterWhere(['like', 'ai.NamaMahasiswa', $this->namaMahasiswaText])
            ->andFilterWhere(['like', 'ais3.ProgramStudi', $this->ProgramStudi])
            ->andFilterWhere(['like', 'ai.TanggalMasuk', $this->TanggalMasuk])
            ->andFilterWhere(['like', 'ais3.TanggalKeluar', $this->TanggalKeluar]);

        return $dataProvider;
    }
}

I thought there must be something wrong in my query filter

$query->andFilterWhere(['like', 'ais3.NRP', $this->NRP])
            ->andFilterWhere(['like', 'ai.NamaMahasiswa', $this->namaMahasiswaText])
            ->andFilterWhere(['like', 'ais3.ProgramStudi', $this->ProgramStudi])
            ->andFilterWhere(['like', 'ai.TanggalMasuk', $this->TanggalMasuk])
            ->andFilterWhere(['like', 'ais3.TanggalKeluar', $this->TanggalKeluar]);

but I dont know how to fix those codes. Could you please help me to solve this? Thankyou