Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
te sach » toc sach
van cua » vang cua, ban cua, dan cua
tuc van » thuc van, truc van, duc van
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
tuc va » thuc va, truc va, tuc xa
ve cac » va cac, vien cac

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 tang) or (ky dang)) xa hoi. hieu ve cac ((tuc van) OR (tuc va)) doanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky tang) OR (ky dang)) xa hoi. hieu ve cac ((tuc van) OR (tuc va)) doanh van cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky tang) or (ky dang)) xa hoi. hieu ve cac ((tuc van) OR (tuc va)) doanh van cua tre*".