Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh ghep » trinh phap, trinh nhap, trinh nghien
trinh nghe » trinh nghien, trinh nha
trinh he » trinh han, trinh hoa, trinh thi
so hanh » so sanh, so danh, co hanh
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.

• Performing a fuzzy search may retrieve terms with similar spellings: (( so hanh trinh ghep tu hoc ) or ( duy khanh ((trinh nghe) OR (trinh he)) du hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so hanh trinh ghep tu hoc ) OR ( duy khanh ((trinh nghe) OR (trinh he)) du hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( so hanh trinh ghep tu hoc ) or ( duy khanh ((trinh nghe) OR (trinh he)) du hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( so hanh trinh ghep tu hoc ) or ( duy khanh ((trinh nghe) OR (trinh he)) du hoc ))*.