Perhaps you should try some spelling variations:
trinh nghiep » trinh nghien, trinh ghep, trinh nhiet
khanh trinh » thanh trinh, nhanh tinh, thanh tinh
hanh trinh » canh tranh, hanh chinh
trinh nghe » trinh nghien, trinh he, trinh nha
nghiep tu » nghiep vu, nghiep vua, nghiep cua
duoc hoc » quoc hoi
so hanh » so sanh, so danh, co hanh
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 nghiep tu hoc ) or ( duy khanh trinh nghe ((du hoc) OR (duoc hoc)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so hanh trinh nghiep tu hoc ) OR ( duy khanh trinh nghe ((du hoc) OR (duoc hoc)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( so hanh trinh nghiep tu hoc ) or ( duy khanh trinh nghe ((du hoc) OR (duoc hoc)) ))".
• Adding a wildcard symbol may retrieve word variants: (( so hanh trinh nghiep tu hoc ) or ( duy khanh trinh nghe ((du hoc) OR (duoc hoc)) ))*.