Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu quan » hieu qua, lieu quan, thien quan
truong va » truong dai, truong cao, truong dao
cong vang » cong lang, cong quang, cong ngang
nho hieu » nha hieu, nho sieu, nhu hieu
trung va » trang va, trung ha, trung tam
tuan tap » toan tap, tuan tai, tuyen tap
quan tai » quan tri, quang tri, quan li

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

• Performing a fuzzy search may retrieve terms with similar spellings: nho hieu quan - thanh ((trung va) or (truong va)) nhung cong vang ((tuan tap) or (quan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho hieu quan - thanh ((trung va) OR (truong va)) nhung cong vang ((tuan tap) OR (quan tai)).
• Adding a wildcard symbol may retrieve word variants: nho hieu quan - thanh ((trung va) or (truong va)) nhung cong vang ((tuan tap) or (quan tai))*.