Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
cua triet » cua viet, su triet, va triet
va doanh » van doanh, vay doanh, va danh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cao hoi » cau hoi, co hoi, cao hoc
thuc va » thuc vat, thuc dan, thuc day
van cua » vang cua, ban cua, dan cua
va lam » van lam, va lap
va am » 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 cao hoi. hieu ((va am) OR (va lam)) thuc va doanh van cua triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang cao hoi. hieu ((va am) or (va lam)) thuc va doanh van cua triet*.