Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, truong thanh
tieu xanh » tieu danh, chieu xanh, dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
luan hang » luan nang, luan han, luan hung
cong tan » cong tac, cong san, cong ty
toan cao » toan ban
toan tap » toan 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: theo tieu xanh - hanh tang luan hang ((cong thanh) OR (cong tan)) ((toan cao) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - hanh tang luan hang ((cong thanh) OR (cong tan)) ((toan cao) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - hanh tang luan hang ((cong thanh) OR (cong tan)) ((toan cao) or (toan tap))*.