Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach va » sach xa, sach ha, sach dao
cua tre » cua te, cua triet, dua tren
xa hanh » xa thanh, xa khanh, va hanh
cuu tre » cau tren, cau treo
nang xa » nang x, lang xa, nang ma
va nang » van nang, da nang, cam nang
va cam » va cham, va cac, va cai
xuc xa » tuc xa, buc xa
va cao » va cac, va co, va dao

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 va nang xa hoi. hieu ((va cam) OR (va cao)) xuc xa hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach va nang xa hoi. hieu ((va cam) OR (va cao)) xuc xa hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach va nang xa hoi. hieu ((va cam) OR (va cao)) xuc xa hanh vi ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach va nang xa hoi. hieu ((va cam) OR (va cao)) xuc xa hanh vi ((cua tre) or (cuu tre))*.