Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
tranh cua » doanh cua, manh cua
cua trong » cua truong, cua trung, qua trong
thanh lap » thanh san, phan lap, thanh van
thanh hai » thanh phan, thanh hoa, thanh san
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tan » cong tac, cong san, cong thanh

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 - canh tranh cua trong ((cong dong) or (cong tan)) ((thanh lap) or (thanh hai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu quan - canh tranh cua trong ((cong dong) OR (cong tan)) ((thanh lap) OR (thanh hai)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu quan - canh tranh cua trong ((cong dong) or (cong tan)) ((thanh lap) or (thanh hai))*.