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
cong tan » cong tac, cong san, cong ty
toan ban » van ban
tang va » trang va, tang van, thang va
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: theo tieu xanh - hanh tang va nang ((cong tan) OR (cong thanh)) ((toan tap) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - hanh tang va nang ((cong tan) OR (cong thanh)) ((toan tap) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - hanh tang va nang ((cong tan) OR (cong thanh)) ((toan tap) or (toan ban))*.