Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
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 tren, cau treo
cu tren » tu tren, dua tren

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

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