Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
tieu xanh » tieu danh, chieu xanh, dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
cong san » cong tac
toan cao » toan ban
toan tap » toan ban
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 - hanh tang va nhung ((cong thanh) or (cong san)) ((toan cao) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - hanh tang va nhung ((cong thanh) OR (cong san)) ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - hanh tang va nhung ((cong thanh) or (cong san)) ((toan cao) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - hanh tang va nhung ((cong thanh) or (cong san)) ((toan cao) OR (toan tap))*.