Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
hieu quan » hieu qua, lieu quan, thien quan
pho thong » he thong
tung pho » tung ho, ung pho, truong pho
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan tap » toan ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu lang) OR (hieu quan)) - thanh tung pho thong ((cong dan) OR (cong tan)) toan tap~.
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu lang) or (hieu quan)) - thanh tung pho thong ((cong dan) or (cong tan)) toan tap*.