Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, dieu hanh, hien hanh
thang va » hang va, trang va, thong va
cong van » cong vang, cong san, song van
van quan » van ban
quan tap » quan tai, quan lap, quan tam
tang va » trang va, tang van, 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 (thang va)) nhung cong van quan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - hanh ((tang va) OR (thang va)) nhung cong van quan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (hieu nganh)) - hanh ((tang va) OR (thang va)) nhung cong van quan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hieu nganh)) - hanh ((tang va) OR (thang va)) nhung cong van quan tap*.