Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu lang » chieu sang, hieu quang, nhieu tang
nang cong » nang song, dang cong, bang cong
trung va » truong va, trang va, trung ha
cong tac » cong ty
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
va nang » van nang, da nang, cam nang

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: doc ((chieu xanh) OR (hieu lang)) - thanh trung va nang cong tac ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((chieu xanh) or (hieu lang)) - thanh trung va nang cong tac ((toan cau) OR (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: doc ((chieu xanh) or (hieu lang)) - thanh trung va nang cong tac ((toan cau) OR (toan ban))*.