Simplesearch returned all language page

I’m using simplesearch, when i select English langugae, i selected in zhe select bar ,it returned English
page. But when i select Chinese language (cn , i have changed zhe languages.yaml ,you can look at img) , it returned all pages (English and Chinese). I don’t know how to solve it, please help me…Thanks Img

…i know what happened,i writed English content in Chinese page…and then it returned English content when i searched in Chinese page…