Perhaps you should try some spelling variations:
trinh nghien » kinh nghiem, trinh thiet, trinh dien
thanh trinh » hanh trinh, thanh tinh, thanh binh
trinh ghep » trinh he, trinh phap, trinh nhap
trinh nghe » trinh he, trinh nha
co thanh » cho thanh, o thanh, co tranh
ghep tu » nghiep tu, ghep tuoi
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: (( co thanh trinh ghep tu hoc ) OR ( duy khanh ((trinh nghe) OR (trinh nghien)) du hoc ))~.
• Adding a wildcard symbol may retrieve word variants: (( co thanh trinh ghep tu hoc ) or ( duy khanh ((trinh nghe) or (trinh nghien)) du hoc ))*.