Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
dua tren » dung tren
van hanh » van thanh, ban hanh, van anh
sach ly » sach y, sach lo, sach ty
duc van » duc va, duc tan, duc manh
qua cac » cua cac
qua cam » qua cham, qua ca, qua cai
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
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: hoc sach ly nang xa hoi. hieu ((qua cam) OR (qua cac)) duc van hanh vi ((dua tren) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ly nang xa hoi. hieu ((qua cam) OR (qua cac)) duc van hanh vi ((dua tren) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: hoc sach ly nang xa hoi. hieu ((qua cam) OR (qua cac)) duc van hanh vi ((dua tren) or (cuu tre))*.