Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
thanh tinh » thanh binh, nhanh tinh, than kinh
hieu manh » chieu xanh, dieu hanh, hien hanh
manh toan » thanh toan, anh tuan, tinh toan
dan toan » van toan, dan than, xuan toan
tinh he » trinh he, hinh he, tinh ha

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu manh) OR (hieu nganh)) - thanh tinh he thong thong ((dan toan) or (manh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (hieu nganh)) - thanh tinh he thong thong ((dan toan) OR (manh toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu manh) OR (hieu nganh)) - thanh tinh he thong thong ((dan toan) or (manh toan)) cao".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) OR (hieu nganh)) - thanh tinh he thong thong ((dan toan) or (manh toan)) cao*.