Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
va doanh » van doanh, vay doanh, va danh
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, tu cach
van cua » vang cua, ban cua, dan cua
cao suc » cao su
cao duc » dao duc, giao duc, tao duoc
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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: ((tu sach) OR (te sach)) ky tang ma hoi. hieu van ((cao duc) OR (cao suc)) va doanh van cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky tang ma hoi. hieu van ((cao duc) OR (cao suc)) va doanh van cua te~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky tang ma hoi. hieu van ((cao duc) OR (cao suc)) va doanh van cua te*.