Perhaps you should try some spelling variations:
trinh nghiep » trinh nghe, trinh ghep, trinh nhiet
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
sanh trinh » hanh trinh, anh trinh, sinh trinh
sach trinh » sach tranh, hanh trinh, sach kinh
so sanh » do sanh
vu sach » vu bach, su sach, vu khach
nho hoc » cho hoc, nha hoc, pho hoc

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh trinh nghien ((tu hoc) OR (te hoc)) ) OR ( vu sach trinh nghiep nho hoc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( so sanh trinh nghien ((tu hoc) OR (te hoc)) ) or ( vu sach trinh nghiep nho hoc ))~".
• Adding a wildcard symbol may retrieve word variants: (( so sanh trinh nghien ((tu hoc) OR (te hoc)) ) or ( vu sach trinh nghiep nho hoc ))*.