Perhaps you should try some spelling variations:
thieu quan » thieu quang, hieu quan, hieu qua
thien quan » trien quang, lien quan, thien van
thanh tung » thanh cong
cua trong » cua truong, cua trung, qua trong
tung cua » trung cua, tuong cua, dung cua
cong tac » cong ty
than cap » khan cap, thanh lap, thanh cac
phan dau » phan tu, hang dau

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: hoc ((thieu quan) OR (thien quan)) - thanh tung cua trong cong tac ((than cap) OR (phan dau))~.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu quan) or (thien quan)) - thanh tung cua trong cong tac ((than cap) or (phan dau))*.