Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tu cach » tu cac
dan dai » dat dai, can dai, dan dat
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
luc ca » luc cao, luc cua, luc ha
luc va » duc va, tuc va, loc va
va cau » van cau, va cac, va dau
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 ((luc ca) OR (luc va)) 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 ((luc ca) OR (luc va)) dan dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky nang x hoi. hieu va cau ((luc ca) OR (luc va)) dan dai cua tre*.