Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
va cam » va cham, va cac, va cao
va cau » van cau, va cac, va dau
x hoi » xa hoi, o hoi, 5 hoi

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) OR (su sach)) ky nang ((x hoi) OR (x ho)). lieu va cam duc va danh va cau tren~.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (su sach)) ky nang ((x hoi) or (x ho)). lieu va cam duc va danh va cau tren*.