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
qua cham » qua hai, qua cac, va cham
qua cam » qua cac, qua ca, qua cai
sach ly » sach y, sach lo, sach ty
xuc van » duc van, luc van, vuc van
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.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ly nang xa hoi. hieu ((qua cam) OR (qua cham)) xuc van hanh vi ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ly nang xa hoi. hieu ((qua cam) OR (qua cham)) xuc 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 cham)) xuc van hanh vi ((dua tren) or (cuu tre))*".