Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh hung » thanh huong, thanh tung, thanh trung
luong cong » dung cong, trong cong, cong cong
hoc thieu » toc thieu, hoc hien
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
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: hoc thieu xanh - thanh hung ((luong cong) or (cong dong)) cong tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh hung ((luong cong) OR (cong dong)) cong tap toan ban*.