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