Perhaps you should try some spelling variations:
nghiem duoc » nghiem thuoc, nghe duoc
nghiem ban » nghiem xuan, nghiep bang, nghiem va
nghiem van » nghiem va, nghiep van, nghiem xuan
sanh thuc » anh thuc, sinh thuc, danh thuc
sach xet » sach tet, sach viet, sach xa
duoc hoc » quoc hoi
su sach » so sach, vu sach
so sanh » do sanh

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach xet nghiem duoc hoc ) OR ( so sanh thuc ((nghiem ban) OR (nghiem van)) hoc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su sach xet nghiem duoc hoc ) or ( so sanh thuc ((nghiem ban) OR (nghiem van)) hoc ))~".
• Adding a wildcard symbol may retrieve word variants: (( su sach xet nghiem duoc hoc ) or ( so sanh thuc ((nghiem ban) OR (nghiem van)) hoc ))*.