Perhaps you should try some spelling variations:
nghiep khien » nghiep dien, nghiep hieu, nghiep nghiep
thi nghiem » thuc nghiem
xu nghiep » su nghiep, xi nghiep, ngu nghiep
khien hoc » nhiet hoc, dien hoc
nghiem de » nghiem d, nghiem do, nghiem te
tu sach » thu sach, su sach, te sach
sach xu » sach xa, cach xu, mach xu
cac thi » cac thoi, cau thi, can thi
de hoc » te hoc, du hoc, dien hoc

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 xu nghiep khien hoc ) or ( tu cac thi nghiem de hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach xu nghiep khien hoc ) OR ( tu cac thi nghiem de hoc )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach xu nghiep khien hoc ) or ( tu cac thi nghiem de hoc ))*.