Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
tranh nghiem » trac nghiem, trach nhiem, doanh nghiep
trai nghiem » trac nghiem, thi nghiem
khach trai » khac trai, khanh tra, kham trai
cua khach » cua thanh, nha khach
nghiem tu » nghiep tu, nghiem su, nghiem te
thuoc hoc » thuoc ho, thuoc nhom, thuong hoc
so sach » so sanh, bo sach, co sach
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: (( cua khach trai nghiem tu hoc ) or ( so sach ((tranh nghiem) or (trinh nghien)) thuoc hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cua khach trai nghiem tu hoc ) OR ( so sach ((tranh nghiem) OR (trinh nghien)) thuoc hoc )).
• Adding a wildcard symbol may retrieve word variants: (( cua khach trai nghiem tu hoc ) or ( so sach ((tranh nghiem) or (trinh nghien)) thuoc hoc ))*.