Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
hanh tran » hanh trang, thanh tran, hanh tram
lang cong » dang cong, hang cong, lang dong
bang cong » dang cong, bang song, hang cong
van thanh » ban thanh, van tuan
thanh cau » thanh chau, thanh mau, nhanh cau
tran van » luan van

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 ((lang cong) or (bang cong)) van thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quan) OR (hieu qua)) - hanh tran van ((lang cong) OR (bang cong)) van thanh cau.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quan) or (hieu qua)) - hanh tran van ((lang cong) or (bang cong)) van thanh cau*.