Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
chat hoc » chat hoa, chat thom, cho hoc
va doanh » van doanh, vay doanh, va danh
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty hang, ly nang
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
van va » van vat, van van, ban va
va am » va lam, va cam

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 ((ty nang) OR (ty xang)) chat hoc. hieu va am thuc va doanh van va triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty xang)) chat hoc. hieu va am thuc va doanh van va triet*.