Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
hanh vai » hanh va, hanh tai, hanh van
cac tren » ca tren, cau tren, rac tren
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
soc van » hoc van, oc van, sac van
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang x hoi. hieu van cham soc van ((hanh vai) OR (hanh vi)) cac tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang x hoi. hieu van cham soc van ((hanh vai) OR (hanh vi)) cac tren".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang x hoi. hieu van cham soc van ((hanh vai) OR (hanh vi)) cac tren*.