Perhaps you should try some spelling variations:
thuc nghiep » thuc nghiem, thuat nghiep, chu nghiep
thi nghiem » thuc nghiem
thu nghiem » thuc nghiem
sach thi » sach thu, sach tai, sach thieu
nghiem d » nghiem de, nghiem do, nghiem _
su sach » so sach
vu sach » vu bach, vu khach
cua hoi » cua moi
d hoc » du hoc, ad hoc, de hoc

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 thi nghiem d hoc ) OR ( vu sach ((thuc nghiep) OR (thu nghiem)) cua hoi ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su sach thi nghiem d hoc ) or ( vu sach ((thuc nghiep) OR (thu nghiem)) cua hoi ))~".
• Adding a wildcard symbol may retrieve word variants: (( su sach thi nghiem d hoc ) or ( vu sach ((thuc nghiep) OR (thu nghiem)) cua hoi ))*.