Perhaps you should try some spelling variations:
thanh trung » thanh tung
tieu sang » chieu sang, tieu dung, tiem nang
va truong » van truong, xa truong, va thuong
va trong » va thong, va tuong, va trung
cong san » cong tac
than cao » toan cao, thai cao, than cap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sang - thanh trung ((va trong) or (va truong)) cong san ((than cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sang - thanh trung ((va trong) OR (va truong)) cong san ((than cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: theo tieu sang - thanh trung ((va trong) or (va truong)) cong san ((than cao) or (toan ban))*.