Perhaps you should try some spelling variations:
vat doanh » van doanh, vay doanh, va doanh
doanh van » doan van, doanh va, doanh ban
thu sach » tu sach, thuat sach, thuoc sach
cua viet » ca viet, hoa viet, cua vat
ty nang » ty xang, ty hang, ly nang
van cua » vang cua, ban cua, dan cua
co hoi » co hoc, co loi
va am » va lam, va cam

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty nang) OR (ky nang)) co hoi. lieu va am thuc vat doanh van cua viet~".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) OR (ky nang)) co hoi. lieu va am thuc vat doanh van cua viet*.