Perhaps you should try some spelling variations:
khanh trinh » thanh trinh, nhanh tinh, thanh tinh
hanh trinh » canh tranh, hanh chinh
trinh ghep » trinh he, trinh phap, trinh nhap
trinh nghe » trinh nghien, trinh he, trinh nha
nghe duoc » nghiem duoc, nghe nuoi, che duoc
duoc hoc » quoc hoi
so hanh » so sanh, so danh, co hanh
ghep tu » nghiep tu, ghep tuoi
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: (( so hanh trinh ghep tu hoc ) or ( duy khanh trinh nghe duoc 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 duoc hoc )).
• Adding a wildcard symbol may retrieve word variants: (( so hanh trinh ghep tu hoc ) or ( duy khanh trinh nghe duoc hoc ))*.