Perhaps you should try some spelling variations:
trinh nghiep » trinh nghien, trinh nghe, trinh ghep
trai nghiem » trac nghiem
sach trinh » sach tranh, hanh trinh, sach kinh
nghiep sua » nghiep vua, nghiep cua, nghiep luan
thi nghiem » thuc nghiem
su khach » vu khach, su khac, cua khach
su sach » so sach, vu sach
sua hoc » cua hoc, su hoc, sua khoa
de hoc » te hoc, du hoc, dien hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach trinh nghiep sua hoc ) or ( su khach ((trai nghiem) OR (thi nghiem)) de hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach trinh nghiep sua hoc ) OR ( su khach ((trai nghiem) OR (thi nghiem)) de hoc ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su sach trinh nghiep sua hoc ) or ( su khach ((trai nghiem) OR (thi nghiem)) de hoc ))*".