Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
hanh dung » thanh dung, anh dung, hanh dong
trong van » trong cac
anh dong » anh huong, anh son
van toan » van tuan, van tan, van thanh
toan cau » toan cao, toan ban, toan tap
va dung » van dung, va duong, vat dung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) or (chieu sach)) - ((hanh dung) or (anh dong)) va dung trong van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (chieu sach)) - ((hanh dung) OR (anh dong)) va dung trong van toan cau.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (chieu sach)) - ((hanh dung) or (anh dong)) va dung trong van toan cau*.