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

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)) cao hoc. ((hieu va) OR (hieu qua)) am thuc va doanh van va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ty xang)) cao hoc. ((hieu va) OR (hieu qua)) am thuc va doanh van va triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty xang)) cao hoc. ((hieu va) OR (hieu qua)) am thuc va doanh van va triet*.