Perhaps you should try some spelling variations:
chung cong » nhung cong, chong cong, phung cong
luan chung » luan chinh
tang luan » dung luan
doc hieu » toc thieu, hoc thieu
anh tang » anh bang, anh dang, anh nang
cong tac » cong ty
than cau » phan cau, than cap, thanh chau
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 hien)) xanh - anh tang luan chung cong tac ((than cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc hien)) xanh - anh tang luan chung cong tac ((than cau) OR (toan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) OR (hoc hien)) xanh - anh tang luan chung cong tac ((than cau) or (toan cau))".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) OR (hoc hien)) xanh - anh tang luan chung cong tac ((than cau) or (toan cau))*.