Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
sach le » cach le, sach de, sach kem
sach lo » sach dao, sach doi, sach hoi
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
va giao » van giao, va giai, va gia
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 (sach lo)) xang xa hoi. hieu va giao duc va hanh vai va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach le) OR (sach lo)) xang xa hoi. hieu va giao duc va hanh vai va thiet".
• Adding a wildcard symbol may retrieve word variants: su ((sach le) OR (sach lo)) xang xa hoi. hieu va giao duc va hanh vai va thiet*.