How to realize the function of searching

I'm writing some of the features in a web project (similar to a web disk), in which I have difficulty writing a search function that can search the corresponding file by keyword and display it on the home page. But this can only search the original files in the net disk, once a new folder is created, and then named, again using the search, the keyword uses the name of the newly created folder, it cannot be searched, how should this be solved? Was the path written wrong?