Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu sang » chieu sang, hieu lang, hieu quang
trong tan » trong quan, trong cac, trong ca
doc hieu » toc thieu, hoc thieu, hoc hien
vat dung » van dung, va dung, viet dung
tan phan » toan phan, than phan, van phan
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sang - ((thanh trung) or (thanh tung)) vat dung trong tan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - ((thanh trung) OR (thanh tung)) vat dung trong tan phan cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - ((thanh trung) or (thanh tung)) vat dung trong tan phan cau*.