Perhaps you should try some spelling variations:
hieu nganh » hiem ngan, hieu manh, nghiep nganh
vien nganh » vien thanh
nhung cong » dung cong, thong cong, hang cong
trang va » tran van
cong san » cong tac
san toan » van toan, dan toan, 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 nganh) or (vien nganh)) - hanh ((trang va) OR (hang va)) nhung cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu nganh) OR (vien nganh)) - hanh ((trang va) OR (hang va)) nhung cong san toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu nganh) or (vien nganh)) - hanh ((trang va) OR (hang va)) nhung cong san toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu nganh) or (vien nganh)) - hanh ((trang va) OR (hang va)) nhung cong san toan cao*.