Perhaps you should try some spelling variations:
nghiem duoc » nghiem thuoc, nghe duoc
nghiem ban » nghiem van, nghiem xuan, nghiep bang
khac thi » khau thi, khuat thi, khac trai
duoc hoc » quoc hoi
khuc thi » thuc thi, chuc thi, phuc thi
va khac » va khao, va kha, vu khac
ty khuc » ty khac, ty thuc, ty thuoc
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: (( va khac thi nghiem duoc hoc ) or ( ty khuc thi nghiem ban hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( va khac thi nghiem duoc hoc ) OR ( ty khuc thi nghiem ban hoc )).
• Adding a wildcard symbol may retrieve word variants: (( va khac thi nghiem duoc hoc ) or ( ty khuc thi nghiem ban hoc ))*.