Perhaps you should try some spelling variations:
nghiem dong » nghiem song, nghiem cong, nghiep dong
thai nghien » thai nguyen, phap nghien, phan nghien
thi nghiem » thuc nghiem
sach thai » sach tham, sac thai, sach tai
nghien d » nghiem d, nghien o, nghiem de
vu khach » vu khanh, vu khac, cua khach
dong hoc » dong co, dong luc
so sach » so sanh, bo sach, co sach
d hoc » du hoc, ad hoc, de 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 sach thai nghien d hoc ) or ( ((vu khach) OR (vay khach)) thi nghiem dong hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach thai nghien d hoc ) OR ( ((vu khach) OR (vay khach)) thi nghiem dong hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( so sach thai nghien d hoc ) or ( ((vu khach) OR (vay khach)) thi nghiem dong hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( so sach thai nghien d hoc ) or ( ((vu khach) OR (vay khach)) thi nghiem dong hoc ))*.