Perhaps you should try some spelling variations:
thien van » thi van
van cham » van chat, van tham, va cham
van hanh » van thanh, ban hanh, van anh
so sach » bo sach, co sach, hoc sach
so sanh » do sanh
soc van » hoc van, oc van, sac van
voi cac » loi cach
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) OR (so sanh)) ky nang x hoi. thien van cham soc van hanh ((va cac) or (voi cac)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) ky nang x hoi. thien van cham soc van hanh ((va cac) OR (voi cac)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) ky nang x hoi. thien van cham soc van hanh ((va cac) or (voi cac)) tren".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) ky nang x hoi. thien van cham soc van hanh ((va cac) or (voi cac)) tren*.