Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
cuu tre » cua tre, cau treo

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 tang xa hoi. hieu va cac ((xuc van) or (duc tan)) hanh vi ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky tang xa hoi. hieu va cac ((xuc van) OR (duc tan)) hanh vi ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky tang xa hoi. hieu va cac ((xuc van) or (duc tan)) hanh vi ((cuu tre) or (cau tren))*.