Perhaps you should try some spelling variations:
thanh tran » thanh trang, thanh toan, thanh tra
phung cong » nhung cong, phong cong, nhung chong
hieu quan » hieu qua, lieu quan, thien quan
van phung » van phong, van hung, van chuong
hoc hieu » hoc thieu, hoc hien, doc hieu
tran van » luan van
cong ban » cong bang, cong san, cong tan
than man » thanh san, tran manh, than phan
than ma » than va, khan ma, nhan ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu quan - thanh tran van phung cong ban ((than man) or (than ma))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu quan - thanh tran van phung cong ban ((than man) OR (than ma)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu quan - thanh tran van phung cong ban ((than man) or (than ma))*.