Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
qua cam » qua cham, qua cac, qua ca
cua tre » cua te, cuu tre, cua triet
xuc va » luc va, xac va
tuc va » thuc va, truc va, tuc xa

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 ky lang xa hoi. hieu qua cam ((((xuc va) or (tuc va))) or (duc va)) thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang xa hoi. hieu qua cam ((((xuc va) OR (tuc va))) OR (duc va)) thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang xa hoi. hieu qua cam ((((xuc va) or (tuc va))) or (duc va)) thanh dai cua tre*.