Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
qua cham » qua hai, qua cac, va cham
ky lang » ky nang, tay lang
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
soc van » hoc van, oc van, sac van
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ((((ky lang) OR (ky tang))) or (ky dang)) xa hoi. hieu qua cham soc van doanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((((ky lang) OR (ky tang))) OR (ky dang)) xa hoi. hieu qua cham soc van doanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ((((ky lang) OR (ky tang))) or (ky dang)) xa hoi. hieu qua cham soc van doanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ((((ky lang) OR (ky tang))) or (ky dang)) xa hoi. hieu qua cham soc van doanh tai cua tre*.