Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
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
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
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 (chieu sach))) OR (hieu lang)) - thanh trung va nang cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((((chieu xanh) OR (chieu sach))) or (hieu lang)) - thanh trung va nang cong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: doc ((((chieu xanh) OR (chieu sach))) or (hieu lang)) - thanh trung va nang cong tac toan cau*.