Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh hai » thanh hai, nhanh hai, hang hai
hieu va » lieu va, hieu qua
va cham » va chat, va tham
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
xuc va » tuc va, xac va
luc va » tuc va, loc va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang x hoi. hieu va cham ((xuc va) or (((luc va) OR (duc va)))) hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu va cham ((xuc va) OR (((luc va) OR (duc va)))) hanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. hieu va cham ((xuc va) or (((luc va) OR (duc va)))) hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu va cham ((xuc va) or (((luc va) OR (duc va)))) hanh hai cua tre*.