Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
van dai » vanh dai, van dao, van hai
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, xac va
luc va » duc 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 ty nang x hoi. hieu va cac ((xuc va) OR (luc va)) van dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang x hoi. hieu va cac ((xuc va) OR (luc va)) van dai cua tre*".