Perhaps you should try some spelling variations:
trinh nghiep » trinh nghe, trinh ghep, trien nghiep
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
trinh nhiet » trinh thiet, trinh viet, trinh triet
hanh trinh » canh tranh, hanh chinh
nghien du » nghiep du, nghien cuu, nghiem dau
duy hanh » duy khanh, duy nhanh, du hanh
so hanh » so sanh, so danh, co hanh
tu hoc » te hoc
du hoc » duoc hoc

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

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