Perhaps you should try some spelling variations:
thi nghiem » thuc nghiem
thu nghiem » thuc nghiem
nghiem do » nghiem d, nghiem de, nghiem duoc
sanh thu » sach thu, san thu, doanh thu
nghiem y » nghiep y, nghiem _, nghiem d
sach thi » sach thu, sach tai, sach thieu
so sanh » do sanh
tu sach » thu sach, su sach, te sach
do hoc » co hoc, do hoa, du 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 sanh thu nghiem y hoc ) or ( tu sach thi nghiem do hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh thu nghiem y hoc ) OR ( tu sach thi nghiem do hoc )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh thu nghiem y hoc ) or ( tu sach thi nghiem do hoc ))*.