Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
cua nam » cua tam, cua ngan, cua nhan
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ca nam » cai nam, ha nam, va nam
qua va » quan va, qua van, vua va
x hoi » xa hoi, o hoi, x ho

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: tu ((sach ky) OR (sach ty)) nang x hoi. hieu ((ca nam) OR (cua nam)) qua va hanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach ty)) nang x hoi. hieu ((ca nam) OR (cua nam)) qua va hanh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) nang x hoi. hieu ((ca nam) OR (cua nam)) qua va hanh dai cua tre*.