Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
cua triet » cua viet, su triet, va triet
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc day
van cua » vang cua, ban cua, dan cua
x hoi » xa hoi, o hoi, x ho
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 ky nang x hoi. hieu va am ((thuc va) OR (thuc dan)) doanh van cua triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu va am ((thuc va) or (thuc dan)) doanh van cua triet*.