Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
sach le » sach de, sach lo, sach kem
cach le » cach de, cac le, cach ben
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va, hieu van
ve giao » te giao, viet giao, van giao
va hanh » van hanh, va thanh, va danh
vai va » mai va, dai va, hai va
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach le) OR (cach le)) xang xa hoi. hieu ve giao duc va hanh vai va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach le) OR (cach le)) xang xa hoi. hieu ve giao duc va hanh vai va thiet".
• Adding a wildcard symbol may retrieve word variants: su ((sach le) OR (cach le)) xang xa hoi. hieu ve giao duc va hanh vai va thiet*.