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
sach ky » sach y, sach ty, sach kem
soc van » hoc van, oc van, sac van
voi cac » loi cach
sac ky » cac ky, sai ky
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) OR (sac 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 ky) OR (sac 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 ky) OR (sac 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 ky) OR (sac ky)) nang x hoi. thien van cham soc van hanh ((va cac) or (voi cac)) tren*.