Perhaps you should try some spelling variations:
trinh nghiep » trinh nghien, trinh nghe, trinh ghep
sach trinh » sach tranh, sach kinh, sach tren
nghiep cua » nghiep vua, nghiep luan, nghien cuu
hanh trinh » canh tranh, hanh chinh
duy hanh » duy khanh, duy nhanh, du hanh
nghe duc » nghe duoc, nghe thuc, nghe dung
so sach » so sanh, bo sach, co sach
cua hoc » cua hoi, cua thuoc, cua nuoc
nghe du » nghe xu, nghe di, nghe tu

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 cua hoc ) or ( duy hanh trinh ((nghe du) or (nghe duc)) hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach trinh nghiep cua hoc ) OR ( duy hanh trinh ((nghe du) OR (nghe duc)) hoc )).
• Adding a wildcard symbol may retrieve word variants: (( so sach trinh nghiep cua hoc ) or ( duy hanh trinh ((nghe du) or (nghe duc)) hoc ))*.