Perhaps you should try some spelling variations:
nhung trong » hung trong, nhung tuong, thuong trong
hieu nganh » vien nganh, hiem ngan, nghiep nganh
trong vinh » trong kinh, trong sinh, trong linh
hieu manh » chieu xanh, dieu hanh, hien hanh
vinh toan » tinh toan, hinh toan, minh toan
tang van » dang van, hoang van, trong van
toan ban » van ban
tang va » trang va, thang va, tang vat

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)) - hanh ((tang va) OR (tang van)) nhung trong vinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - hanh ((tang va) OR (tang van)) nhung trong vinh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (hieu nganh)) - hanh ((tang va) OR (tang van)) nhung trong vinh toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hieu nganh)) - hanh ((tang va) OR (tang van)) nhung trong vinh toan ban*.