Perhaps you should try some spelling variations:
thie nghiem » thi nghiem, thuc nghiem, thu nghiem
trai nghiem » trac nghiem, thi nghiem
thuat thie » thuat thiet, thuat nhiet, thuat chiet
thu thuat » phau thuat, thu hut
phai trai » phai tai, khac trai, thai tai
nghiem de » nghiem do, nghiem te, nghiem ve
nghiem d » nghiem do, nghiem _, nghiem h
vu phai » vu hai, cu phai, vu phat
de hoc » te hoc, du hoc, dien hoc
d hoc » du hoc, ad hoc, y hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu thuat thie nghiem d hoc ) or ( vu phai trai nghiem de hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu thuat thie nghiem d hoc ) OR ( vu phai trai nghiem de hoc )).
• Adding a wildcard symbol may retrieve word variants: (( thu thuat thie nghiem d hoc ) or ( vu phai trai nghiem de hoc ))*.