Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
thu sach » tu sach, thuat sach, thuoc sach
dua tren » dung tren
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve tham » va tham, ve cham, vi tham
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo

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 ty nang xa hoi. hieu ve tham thuc va hanh vi ((dua tren) OR (cuu tre))~.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. hieu ve tham thuc va hanh vi ((dua tren) or (cuu tre))*.