Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
nghien duoc » nghiem duoc, nghe duoc, nghia duoc
sach trinh » sach tranh, hanh trinh, sach kinh
nghiem de » nghiem do, nghiem te, nghiem ve
nghiem d » nghiem do, nghiem _, nghiem h
toc sach » hoc sach, doc sach, thuoc sach
duoc hoc » quoc hoi
cac thu » cach thuc, cac thoi
ve cac » va cac, vien cac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( ve cac thu ((nghiem de) OR (nghiem d)) hoc ) OR ( toc sach trinh nghien duoc hoc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ve cac thu ((nghiem de) OR (nghiem d)) hoc ) or ( toc sach trinh nghien duoc hoc ))~".
• Adding a wildcard symbol may retrieve word variants: (( ve cac thu ((nghiem de) OR (nghiem d)) hoc ) or ( toc sach trinh nghien duoc hoc ))*.