Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tran » thanh trang, thanh toan, thanh tra
xuan trong » xuan truong, quan trong, xuan trung
hien sang » hien trang, khien bang, thien bang
tran xuan » tran quang, tran van
cong tac » cong ty
toan cau » toan cao, toan tap, toan tai
toan ban » van 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: hoc ((hien sang) OR (chieu sang)) - thanh tran xuan trong cong tac ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sang) OR (chieu sang)) - thanh tran xuan trong cong tac ((toan cau) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sang) OR (chieu sang)) - thanh tran xuan trong cong tac ((toan cau) or (toan ban))*.