Perhaps you should try some spelling variations:
luan chung » luan chinh
chung cong » nhung cong, chong cong, phung cong
hoc thieu » toc thieu, hoc hien
tang luan » dung luan
doc hieu » toc thieu, hoc hien
anh tang » anh bang, anh dang, anh nang
cong tac » cong ty
phan cau » phan dau, phan cac, phan tu
toan cau » 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: ((doc hieu) or (hoc thieu)) xanh - anh tang luan chung cong tac ((phan cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc thieu)) xanh - anh tang luan chung cong tac ((phan cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc thieu)) xanh - anh tang luan chung cong tac ((phan cau) or (toan cau))*.