Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
va doanh » van doanh, vay doanh, va danh
su sach » vu sach
van cua » vang cua, ban cua, dan cua
so sach » so sanh, bo sach, co sach
lam duc » lam duoc, pham duc, nam duoc
mai hoi » mai khoi, dai hoi, lai hoi
cua tu » cua tuc, cua su, cua cu
va lam » van lam, va lap
ma hoi » xa hoi, ma hoa, me hoi

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: ((su sach) OR (so sach)) ky nang ((ma hoi) OR (mai hoi)). lieu va lam duc va doanh van cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky nang ((ma hoi) or (mai hoi)). lieu va lam duc va doanh van cua tu~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky nang ((ma hoi) or (mai hoi)). lieu va lam duc va doanh van cua tu*.