Perhaps you should try some spelling variations:
trinh nghien » kinh nghiem, trinh thiet, trinh dien
khanh trinh » hanh trinh, thanh trinh, nhanh tinh
sach trinh » sach tranh, hanh trinh, sach kinh
trinh nghe » trinh he, trinh nha
nghien tu » nghiep tu, nghien cuu, nghiep vu
su sach » so sach, vu sach
nghe xu » nghe thu
tu hoc » te hoc
xu hoc » du hoc, su hoc, xa hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach trinh nghien tu hoc ) or ( duy khanh trinh nghe xu hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach trinh nghien tu hoc ) OR ( duy khanh trinh nghe xu hoc ))*.