Perhaps you should try some spelling variations:
cua triet » su triet, va triet
doanh ban » doanh bat, doanh van, doanh nhan
cua viet » ca viet, hoa viet, cua vat
va doanh » van doanh, vay doanh, va danh
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach thu, xach tay
cao hoc » co hoc, cho hoc, chat hoc
sach tu » sach thu, cach tu, sach uu
hieu va » lieu va, hieu qua
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) OR (sach tu)) nang cao hoc. hieu va am thuc va doanh ban ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach tu)) nang cao hoc. hieu va am thuc va doanh ban ((cua triet) OR (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach tu)) nang cao hoc. hieu va am thuc va doanh ban ((cua triet) OR (cua viet))*.