Perhaps you should try some spelling variations:
nghiem thuoc » nghiem hoa, nghi thuc, nghiem thi
nghiem duoc » nghe duoc
tham nghiep » thuat nghiep, lam nghiep, tam nghien
sach tham » sach nha
nghiep va » nghiep vu
toc sach » hoc sach, doc sach, thuoc sach
sach tai » sach bai, sach dao, sach xa
vu sach » vu bach, su sach, vu khach
va hoc » van 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: (( toc sach tai ((nghiem duoc) OR (nghiem thuoc)) hoc ) OR ( vu sach tham nghiep va hoc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( toc sach tai ((nghiem duoc) OR (nghiem thuoc)) hoc ) or ( vu sach tham nghiep va hoc ))~".
• Adding a wildcard symbol may retrieve word variants: (( toc sach tai ((nghiem duoc) OR (nghiem thuoc)) hoc ) or ( vu sach tham nghiep va hoc ))*.