Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
luoc van » luoc can, luoc va, luc van
lang xa » lang ha, dang xay, lang van
hieu tu » chieu tu, hieu tuc, hien tu
tu cham » toc cham, thi cham
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
y lang » o lang, _ lang, tay lang

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

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