Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
trinh nghiep » trinh nghe, trinh nhiet, trien nghiep
nghien duoc » nghiem duoc, nghe duoc, nghia duoc
trinh ghep » trinh he, trinh nghe, trinh phap
hanh trinh » canh tranh, hanh chinh
duy hanh » duy khanh, duy nhanh, du hanh
duoc hoc » quoc hoi
bo sach » co sach, hoc 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: (( bo sach ((trinh nghiep) or (trinh ghep)) tu hoc ) or ( duy hanh trinh nghien duoc hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( bo sach ((trinh nghiep) OR (trinh ghep)) tu hoc ) OR ( duy hanh trinh nghien duoc hoc )).
• Adding a wildcard symbol may retrieve word variants: (( bo sach ((trinh nghiep) or (trinh ghep)) tu hoc ) or ( duy hanh trinh nghien duoc hoc ))*.