Perhaps you should try some spelling variations:
biet nghia » viet nghin
biet nghi » biet nguoi, viet nghin, biet noi
sach danh » sach tranh, sach dao, sach dung
nhung co » nhung con, nhung bo, chung co
sach dat » sach dao, sach bai, sach xa
co dai » co dan, do dai
dai bi » dai li, dai bieu

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: su ((sach dat) OR (sach danh)) nuoc ((biet nghia) OR (biet nghi)) cua ets : nhung co dai bi đai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach dat) OR (sach danh)) nuoc ((biet nghia) or (biet nghi)) cua ets : nhung co dai bi đai~".
• Adding a wildcard symbol may retrieve word variants: su ((sach dat) OR (sach danh)) nuoc ((biet nghia) or (biet nghi)) cua ets : nhung co dai bi đai*.