Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
lam thuc » lam thuoc, am thuc, nam thuc
danh dau » lanh dao, hang dau, danh tu
va triet » va thiet, va trien, ve triet
hieu va » lieu va, hieu qua
danh di » danh du, xanh di, danh dien
te cac » tu cac, ve cac, te cao
va lam » van lam, va lap
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc sach) or (te cac)) ky nang x hoi. hieu va lam thuc vat ((danh di) or (danh dau)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (te cac)) ky nang x hoi. hieu va lam thuc vat ((danh di) OR (danh dau)) va triet.
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (te cac)) ky nang x hoi. hieu va lam thuc vat ((danh di) or (danh dau)) va triet*.