Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tran » thanh trang, thanh toan, thanh tra
hoc thieu » toc thieu, hoc hien
tran van » luan van
van bang » van ban, van nang, von bang
cong tac » cong ty
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 thieu xanh - thanh tran van bang ((cong san) OR (cong tac)) ((toan tap) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh tran van bang ((cong san) OR (cong tac)) ((toan tap) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh tran van bang ((cong san) OR (cong tac)) ((toan tap) or (toan ban))*.