Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
tham hoa » pham hoa, thanh hoa, pham khoa
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
sach ky » sac ky, sach y, sach ty
tham oc » tham nuoc, cham soc
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang x hoi. hieu van ((tham oc) OR (tham hoa)) van hanh lai cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang x hoi. hieu van ((tham oc) OR (tham hoa)) van hanh lai cua tre*.