Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
hieu manh » chieu xanh, dieu hanh, hien hanh
tranh qua » thanh qua, trinh qua, tranh quang
tranh cua » doanh cua, manh cua
dung cong » dung trong
than cao » toan cao, thai cao, than cap
ty than » ty thanh, te than, tu than

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)) - canh ((tranh qua) or (tranh cua)) dung cong ty than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - canh ((tranh qua) OR (tranh cua)) dung cong ty than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (hieu nganh)) - canh ((tranh qua) or (tranh cua)) dung cong ty than cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (hieu nganh)) - canh ((tranh qua) or (tranh cua)) dung cong ty than cao*.