Perhaps you should try some spelling variations:
trien nghiep » trinh nghien, vien nghien, bien nghien
thieu nghiep » nghiep nghiep, thieu nhi, thi nghiem
phan nghien » phap nghien, luan nghien
thuat sach » thuat lanh, thuat san
nguoi sach » nguoi san, nuoc sach
sach phan » sach han, mach phan, sach phat
nghien de » nghiem de, nghiep ke, nghiem d
de hoc » te hoc, du hoc, dien hoc
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: (( thuat sach phan nghien de hoc ) or ( nguoi sach ((thieu nghiep) OR (trien nghiep)) tu hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuat sach phan nghien de hoc ) OR ( nguoi sach ((thieu nghiep) OR (trien nghiep)) tu hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thuat sach phan nghien de hoc ) or ( nguoi sach ((thieu nghiep) OR (trien nghiep)) tu hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( thuat sach phan nghien de hoc ) or ( nguoi sach ((thieu nghiep) OR (trien nghiep)) tu hoc ))*.