Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hoc sach » hoc sinh, hoc cac, hoc anh
va thanh » gia thanh, va tinh, le thanh
dat cua » dai cua, day cua, mat cua
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du
ma hoi » xa hoi, ma hoa, me hoi

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: hoc sach ky nang ((ma hoi) OR (mai hoi)). hieu ve cac tu ((va thanh) OR (ban thanh)) dat cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang ((ma hoi) or (mai hoi)). hieu ve cac tu ((va thanh) OR (ban thanh)) dat cua tre~".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang ((ma hoi) or (mai hoi)). hieu ve cac tu ((va thanh) OR (ban thanh)) dat cua tre*.