Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, ban hanh, van anh
sach ly » sach y, sach lo, sach ty
nang xa » lang xa, nang ma, mang xa
qua cam » qua cham, qua cac, qua ca
xuc van » duc van, luc van, vuc van
cua tre » cua te, cua triet, dua tren
cuu 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) OR (nang x)) hoi. hieu qua cam xuc van hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ly ((nang xa) OR (nang x)) hoi. hieu qua cam xuc van hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ly ((nang xa) OR (nang x)) hoi. hieu qua cam xuc van hanh vi ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: hoc sach ly ((nang xa) OR (nang x)) hoi. hieu qua cam xuc van hanh vi ((cua tre) or (cuu tre))*.