Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh trinh » canh tranh, hanh chinh
trong van » trong cac
trinh va » trinh van, trinh vat, trinh ve
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: theo ((chiet tach) or (chieu sach)) - hanh trinh va dung trong van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chiet tach) OR (chieu sach)) - hanh trinh va dung trong van toan cau.
• Adding a wildcard symbol may retrieve word variants: theo ((chiet tach) or (chieu sach)) - hanh trinh va dung trong van toan cau*.