Perhaps you should try some spelling variations:
trinh viet » ninh viet, trinh vat
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tien anh » tieng anh, tien manh, dien anh
trinh va » trinh van, trinh vat, trinh ve
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, 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: hoc ((hieu manh) or (tien anh)) - hanh ((trinh viet) or (trinh va)) nhung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (tien anh)) - hanh ((trinh viet) OR (trinh va)) nhung cong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (tien anh)) - hanh ((trinh viet) or (trinh va)) nhung cong dan toan cau*.