website 404 Not Found from some locations

I Have migrated website from physical server running on apache to virtual machine running on nginx.

when I go to website direct link, website is up : http://www.via-ap.com

but when I go to google and if I click on website on right panel, I get a 404 error.

enter image description here

see below :

https://www.google.fr/search?ei=Ri3jW4TXDZGalwSL46vQAQ&q=via+ap&oq=via+ap&gs_l=psy-ab.3...4929.5483.0.5646.6.5.0.0.0.0.0.0..0.0....0...1c.1.64.psy-ab..6.0.0....0.76V4PDLEtNM

Do you know why?

Thanks L.