Perhaps you should try some spelling variations:
doanh cua » doanh luan
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
cua cua » cua chua, ca cua, qua cua
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
loc va » hoc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang xa hoi. hieu van cau ((xuc va) or (loc va)) doanh cua cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. hieu van cau ((xuc va) OR (loc va)) doanh cua cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu van cau ((xuc va) or (loc va)) doanh cua cua tre*.