Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
van hanh » van anh, van ban, van minh
ban hanh » ban hang
cac tren » ca tren, cau tren, rac tren
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
vai cac » va cac, tai cac, voi cac
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) OR (ban hanh))) or (van thanh)) vai cac tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang x hoi. hieu van cham soc ((((van hanh) OR (ban hanh))) OR (van thanh)) vai 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) OR (ban hanh))) or (van thanh)) vai cac tren".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang x hoi. hieu van cham soc ((((van hanh) OR (ban hanh))) or (van thanh)) vai cac tren*.