Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
hieu van » hieu va, thien van, hieu ve
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
duoc va » nuoc va, duoc ma, duong va
van cua » vang cua, ban cua, dan cua
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 lang xa hoi. ((hieu van) OR (lieu va)) lam ((duoc va) or (duc va)) doanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. ((hieu van) OR (lieu va)) lam ((duoc va) OR (duc va)) doanh van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. ((hieu van) OR (lieu va)) lam ((duoc va) or (duc va)) doanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. ((hieu van) OR (lieu va)) lam ((duoc va) or (duc va)) doanh van cua tre*.