Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
nang quan » ban quan, nang suat
vien anh » vien canh, viet anh, tien anh
dien anh » tieng anh, dien dan
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((vien anh) or (dien anh)) - hanh ((thong quan) or (nang quan)) nhung cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((vien anh) OR (dien anh)) - hanh ((thong quan) OR (nang quan)) nhung cong san toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((vien anh) or (dien anh)) - hanh ((thong quan) or (nang quan)) nhung cong san toan ban*.