Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
nang doc » nang luc
thuc vay » thuc vat, thuc day, thuc va
doanh va » doan va, doanh tai, doanh cua
sach ky » sac ky, sach y, sach ty
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 ((nang cao) OR (nang doc)) hoi. hieu va am thuc vay doanh va cua triet~.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang cao) or (nang doc)) hoi. hieu va am thuc vay doanh va cua triet*.