Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
van cac » van hac, van bac, dan cac
van cau » van dau, van hau, van chat
dau van » dao van, dam van, dau va
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua
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: thu sach y nang x hoi. hieu ((van cac) or (van cau)) dau van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu ((van cac) OR (van cau)) dau van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu ((van cac) or (van cau)) dau van hanh di cua tre*.