Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thuc dan » thuc hanh, hoc dan
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
danh va » doanh va, hanh va, anh va
x hoi » xa hoi, o hoi, x ho
va am » va lam, va cam
va va » va van, va vua, va vai

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: toc sach ky nang x hoi. hieu va am ((thuc vat) OR (thuc dan)) danh va va triet~.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang x hoi. hieu va am ((thuc vat) or (thuc dan)) danh va va triet*.