Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
thuc nghiem » trac nghiem, thi nghiem
sach trinh » sach tranh, hanh trinh, sach kinh
thuat san » thuat toan, thuat song, thuat lanh
nghiem do » nghiem bo, nghiem d, nghiem de
nghien ad » nghiem d, nghien o, nghiep a
san thuc » dan thuc, sat thuc, van thuc
te sach » toc 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: (( thuat san thuc nghiem do hoc ) or ( te sach trinh nghien ad hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuat san thuc nghiem do hoc ) OR ( te sach trinh nghien ad hoc )).
• Adding a wildcard symbol may retrieve word variants: (( thuat san thuc nghiem do hoc ) or ( te sach trinh nghien ad hoc ))*.