Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doanh van » doan van, doanh va, doanh ban
va doanh » van doanh, vay doanh, va danh
nang noi » nang doc
noi hoc » hoi hoc, voi hoc, noi khoa
sach ky » sach y, sach ty, sach kem
thuc va » thuc vat, thuc dan, thuc day
van cua » vang cua, ban cua, dan cua
hieu va » lieu va
sac ky » cac ky, sai ky

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