Perhaps you should try some spelling variations:
trinh nghiep » trinh nghien, trinh nghe, trinh nhiet
khanh trinh » hanh trinh, thanh trinh, nhanh tinh
trinh ghep » trinh he, trinh nghe, trinh phap
trinh ve » trinh he, trinh va, trinh vi
so sach » so sanh, bo sach, co sach
tu hoc » te hoc
du hoc » duoc hoc
ve du » ve su, te du, va du

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach ((trinh nghiep) or (trinh ghep)) tu hoc ) or ( duy khanh trinh ve du hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach ((trinh nghiep) OR (trinh ghep)) tu hoc ) OR ( duy khanh trinh ve du hoc )).
• Adding a wildcard symbol may retrieve word variants: (( so sach ((trinh nghiep) or (trinh ghep)) tu hoc ) or ( duy khanh trinh ve du hoc ))*.