Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
dang xay » dang van, van xay
duong va » duong van, dung va, luong va
te sach » toc sach
van cua » vang cua, ban cua, dan cua
thi van » thi lan, thi hanh, thi nang
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet

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 dang xay hoi. ((thien van) OR (thi van)) lam ((duong va) or (duc va)) doanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang xay hoi. ((thien van) OR (thi van)) lam ((duong va) OR (duc va)) doanh van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang xay hoi. ((thien van) OR (thi van)) lam ((duong va) or (duc va)) doanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang xay hoi. ((thien van) OR (thi van)) lam ((duong va) or (duc va)) doanh van cua tre*.