Perhaps you should try some spelling variations:
cac thoi » cac toi, cac hop, cac tro
su sach » so sach, vu sach
hanh de » hanh ve, hanh kem
va hanh » van hanh, va thanh, va danh
cac thu » cach thuc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ly vang » ly hang, ly van, ly quang
ly nang » ky nang, ly hang, ly quang
de cua » le cua, te cua, dieu cua

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: su sach ((ly nang) OR (ly vang)) xa hoi. hieu ve ((cac thu) OR (cac thoi)) va hanh de cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly nang) or (ly vang)) xa hoi. hieu ve ((cac thu) OR (cac thoi)) va hanh de cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) or (ly vang)) xa hoi. hieu ve ((cac thu) OR (cac thoi)) va hanh de cua tre*.