Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tu cach » tu cac
van cau » van dau, van hau, van chat
dan dai » dat dai, can dai, dan dat
cua tre » cua te, cuu tre, cua triet
va cau » va cac, va dau, va cao
luc ca » luc cao, luc cua, luc va
ca dan » cac dan, ca dao
x hoi » xa hoi, o hoi, x ho

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: ((tu cach) OR (thu sach)) ky nang x hoi. hieu ((va cau) OR (van cau)) luc ca dan dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thu sach)) ky nang x hoi. hieu ((va cau) OR (van cau)) luc ca dan dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky nang x hoi. hieu ((va cau) OR (van cau)) luc ca dan dai cua tre*.