Perhaps you should try some spelling variations:
trinh nghiep » trinh nghien, trinh nghe, trinh ghep
nghiep thuc » nghiem thuc, nghiem thuoc, nghe thuc
sach trinh » sach tranh, hanh trinh, sach kinh
xa nghiem » xet nghiem, van nghiem, va nghien
thuc hoc » phuc hoc, thu hoc, thuc uoc
su sach » so sach, vu sach
sach xa » sach dao, sach nha, sach bai

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 xa nghiem ngu hoc ) or ( su sach trinh nghiep thuc hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach xa nghiem ngu hoc ) OR ( su sach trinh nghiep thuc hoc )).
• Adding a wildcard symbol may retrieve word variants: (( su sach xa nghiem ngu hoc ) or ( su sach trinh nghiep thuc hoc ))*.