Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
sach ly » sach y, sach lo, sach ty
cuc tre » duc tre, cua tre, cuc thue
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cac tac » cac toc, cac bac, cac dac
hieu va » lieu va, hieu qua
hang xa » hoang xa, hang va, hang ca
ly hang » ly quang
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 hang xa hoi. hieu va cac tac ((va hanh) OR (va danh)) tai ((cuc tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ly hang xa hoi. hieu va cac tac ((va hanh) OR (va danh)) tai ((cuc tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ly hang xa hoi. hieu va cac tac ((va hanh) OR (va danh)) tai ((cuc tre) or (cuu tre))*".