Perhaps you should try some spelling variations:
thu nghiem » thuc nghiem, thi nghiem
cach trai » khach trai, cach thoi, cach ta
sach thu » sach thue, sach thieu, sach tham
nghiem y » nghiep y, nghiem _, nghiem d
xach tay » canh tay
su sach » so sach, vu sach
moi hoc » hoi hoc, mon hoc, mi hoc
mo hoc » mon hoc, co 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 thu nghiem y hoc ) or ( tu ((cach trai) or (xach tay)) nghiem ((moi hoc) or (mo hoc)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach thu nghiem y hoc ) OR ( tu ((cach trai) OR (xach tay)) nghiem ((moi hoc) OR (mo hoc)) )).
• Adding a wildcard symbol may retrieve word variants: (( su sach thu nghiem y hoc ) or ( tu ((cach trai) or (xach tay)) nghiem ((moi hoc) or (mo hoc)) ))*.