Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
viet hung » viet huong, viet trung
cong vang » cong lang, cong quang, cong ngang
vat dung » van dung, va dung, viet dung
cong san » cong tac
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu xanh - thanh tung ((vat dung) or (viet hung)) ((cong vang) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh tung ((vat dung) OR (viet hung)) ((cong vang) OR (cong san)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh tung ((vat dung) or (viet hung)) ((cong vang) or (cong san)) toan cao*.