Perhaps you should try some spelling variations:
nghiem ban » nghiem van, nghiem xuan, nghiep bang
trai nghe » thai nghe, trai nghiem, trai nghia
nghe duoc » nghiem duoc, nghe nuoi, che duoc
phai thi » pham thi, phap thi, hai thi
phan thi » pham thi, tran thi, phan tu
ta khac » va khac, ty khac, tan khach
ban hoc » bang hoc, van hoc, bai hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( ta khac trai nghe duoc si ) or ( tu ((phai thi) OR (phan thi)) nghiem ban hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ta khac trai nghe duoc si ) OR ( tu ((phai thi) OR (phan thi)) nghiem ban hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ta khac trai nghe duoc si ) or ( tu ((phai thi) OR (phan thi)) nghiem ban hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( ta khac trai nghe duoc si ) or ( tu ((phai thi) OR (phan thi)) nghiem ban hoc ))*.