Perhaps you should try some spelling variations:
trinh nghiep » trinh nghien, trinh nhiet, trien nghiep
khanh trinh » hanh trinh, thanh trinh, nhanh tinh
trinh ghep » trinh he, trinh phap, trinh nhap
trinh nghe » trinh nghien, trinh he, trinh nha
nghe duoc » nghiem duoc, nghe nuoi, che duoc
duoc hoc » quoc hoi
so sach » so sanh, bo sach, co sach
tu hoc » te hoc

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 nghe duoc 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 nghe duoc hoc )).
• Adding a wildcard symbol may retrieve word variants: (( so sach ((trinh nghiep) or (trinh ghep)) tu hoc ) or ( duy khanh trinh nghe duoc hoc ))*.