Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, hieu ve
giau cua » gian cua, gia cua, dieu cua
sach ky » sac ky, sach y, sach ty
van anh » van thanh, van minh
cua tre » cua te, cuu tre, cua triet
cac lo » cac lop, cac co, cac bo
x hoi » xa hoi, o hoi, x ho
tuan » quan, tran, luan

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang x hoi. ((hieu van) OR (lieu va)) cac lo ((van anh) or (tuan anh)) giau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang x hoi. ((hieu van) OR (lieu va)) cac lo ((van anh) OR (tuan anh)) giau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang x hoi. ((hieu van) OR (lieu va)) cac lo ((van anh) or (tuan anh)) giau cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang x hoi. ((hieu van) OR (lieu va)) cac lo ((van anh) or (tuan anh)) giau cua tre*.