Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
va giao » van giao, va giai, ve giao
sach le » cach le, sach de, sach lo
xang xa » lang xa, mang xa, dang xay
ang xa » lang xa, mang xa, dang xay
va gia » va giai
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 ((xang xa) or (ang xa)) hoi. hieu ((va giao) OR (va gia)) duc va hanh vai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach le ((xang xa) OR (ang xa)) hoi. hieu ((va giao) OR (va gia)) duc va hanh vai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach le ((xang xa) or (ang xa)) hoi. hieu ((va giao) OR (va gia)) duc va hanh vai va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach le ((xang xa) or (ang xa)) hoi. hieu ((va giao) OR (va gia)) duc va hanh vai va thiet*.