Perhaps you should try some spelling variations:
thu nghiem » thuc nghiem
thi nghiem » thuc nghiem
mai nghiep » lam nghiep, xi nghiep, cac nghiep
nghiep van » nghiep va, nghiem van, nghiep can
thu sach » thuat sach, thuoc sach, thu hoach
sach mai » bach mai, sach bai, sach mau
tu sach » su sach, te sach, tu cach
van hoc » van hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach ((thu nghiem) or (thi nghiem)) ad hoc ) or ( thu sach mai nghiep van hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach ((thu nghiem) OR (thi nghiem)) ad hoc ) OR ( thu sach mai nghiep van hoc )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach ((thu nghiem) or (thi nghiem)) ad hoc ) or ( thu sach mai nghiep van hoc ))*.