Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
thuong dai » thuong mai, truong dai, thuong da
thuong dam » thuong mai, huong dan, truong dai
khung cong » nhung cong, khung long, phung cong
hieu manh » chieu xanh, dieu hanh, hien hanh
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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 (hieu nganh)) - thanh ((thuong dai) or (thuong dam)) khung cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - thanh ((thuong dai) OR (thuong dam)) khung cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (hieu nganh)) - thanh ((thuong dai) or (thuong dam)) khung cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (hieu nganh)) - thanh ((thuong dai) or (thuong dam)) khung cong dan toan cao*.