Perhaps you should try some spelling variations:
doanh van » doan van, doanh ban, doanh nhan
thu sach » tu sach, thuat sach, thuoc sach
nang noi » nang doc
doanh va » doan va, doanh tai, doanh cua
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang co » nang cao, nang doc, nang hoc
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
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: thu sach ky ((nang co) OR (nang noi)) hoi. hieu va am thuc va ((doanh van) OR (doanh va)) su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang co) or (nang noi)) hoi. hieu va am thuc va ((doanh van) OR (doanh va)) su triet~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang co) or (nang noi)) hoi. hieu va am thuc va ((doanh van) OR (doanh va)) su triet*.