Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
doanh van » doan van, doanh va, doanh ban
hieu van » thien van, hieu ve
su triet » su viet, su tien, ve triet
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu va » hieu qua
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va
tai ky » thai ky, trai ky, sai ky
ha hoi » hoa hoi, ha noi, xa hoi
van su » dan su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te tai ky lang ha hoi. ((((hieu van) OR (lieu va))) OR (hieu va)) cac tuc van doanh van su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te tai ky lang ha hoi. ((((hieu van) OR (lieu va))) or (hieu va)) cac tuc van doanh van su triet~".
• Adding a wildcard symbol may retrieve word variants: te tai ky lang ha hoi. ((((hieu van) OR (lieu va))) or (hieu va)) cac tuc van doanh van su triet*.