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