Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
va doanh » van doanh, vay doanh, va danh
co sach » bo sach, cuon sach, hoc sach
ty nang » ky nang, ty xang, ly nang
ty hang » ly hang, ty xang, thi hang
van cua » vang cua, ban cua, dan cua
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ((ty nang) or (ty hang)) x hoi. hieu van pham duc va doanh van cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ((ty nang) OR (ty hang)) x hoi. hieu van pham duc va doanh van cua te.
• Adding a wildcard symbol may retrieve word variants: co sach ((ty nang) or (ty hang)) x hoi. hieu van pham duc va doanh van cua te*.