Perhaps you should try some spelling variations:
tieu xanh » tieu danh, chieu xanh, dieu hanh
anh tang » anh bang, anh dang, anh nang
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
tang va » trang va, tang van, thang va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu xanh - anh tang va nhung ((cong tan) OR (cong san)) ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - anh tang va nhung ((cong tan) OR (cong san)) ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - anh tang va nhung ((cong tan) OR (cong san)) ((toan cau) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - anh tang va nhung ((cong tan) OR (cong san)) ((toan cau) or (toan cao))*.