Perhaps you should try some spelling variations:
thuc nghiem » trac nghiem
thu nghiem » thi nghiem
nghiem hoa » nghe hoa, nghiem va
sanh thuc » anh thuc, sinh thuc, danh thuc
nghiem ad » nghiem d, nghiem ban, nghiem lam
cac thu » cach thuc, cac thoi
so sanh » do sanh
su cac » tu cac, su cao, su can

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su cac thu nghiem hoa hoc ) or ( so sanh thuc nghiem ad hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su cac thu nghiem hoa hoc ) OR ( so sanh thuc nghiem ad hoc )).
• Adding a wildcard symbol may retrieve word variants: (( su cac thu nghiem hoa hoc ) or ( so sanh thuc nghiem ad hoc ))*.