Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh thuc » trinh tu, trinh thi
tieu xanh » tieu danh, chieu xanh, dieu hanh
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap

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 trinh thuc ((hang cong) OR (bang cong)) san toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - hanh trinh thuc ((hang cong) OR (bang cong)) san toan cau".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - hanh trinh thuc ((hang cong) OR (bang cong)) san toan cau*.