Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
hanh tran » hanh trang, thanh tran, hanh tram
bang cong » dang cong, bang song, hang cong
thanh cau » thanh chau, nhanh cau, thanh ca
thanh mau » hanh mau, thanh san, thanh hai
tran van » luan van
van bang » van ban, van nang, von bang
cong san » cong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu quan) or (hieu qua)) - hanh tran van bang cong san ((thanh cau) OR (thanh mau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quan) OR (hieu qua)) - hanh tran van bang cong san ((thanh cau) OR (thanh mau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu quan) or (hieu qua)) - hanh tran van bang cong san ((thanh cau) OR (thanh mau))".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quan) or (hieu qua)) - hanh tran van bang cong san ((thanh cau) OR (thanh mau))*.