Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
phan cong » thanh cong
cho hieu » cao hieu, co hieu, chi hieu
gian dan » gian lang
dan dung » van dung, tin dung, ap dung
dung dat » dung va, dung tai
dat van » dao van, dat va, dam van
van phi » van chi, van phu, van nhi
phi dau » phan dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: cho hieu lang - ((phan cong) or (gian dan)) dan dung dat van phi dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cho hieu lang - ((phan cong) OR (gian dan)) dan dung dat van phi dau.
• Adding a wildcard symbol may retrieve word variants: cho hieu lang - ((phan cong) or (gian dan)) dan dung dat van phi dau*.