Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tinh » thanh binh, nhanh tinh, than kinh
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan tap » toan ban
tinh va » tich va, trinh van, trinh vat
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: hoc ((thieu xanh) or (chieu sang)) - thanh tinh va dung cong tan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu sang)) - thanh tinh va dung cong tan toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (chieu sang)) - thanh tinh va dung cong tan toan tap*.