Perhaps you should try some spelling variations:
ban hanh » ban hang
hanh gia » danh gia, thanh gian, hinh giao
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cac bac » cac bai, cac ban, cac cach
gia cua » gian cua, giau cua, gia cuc
cua tre » cua te, cuu tre, cua triet
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((x hoi) or (xa hoi)). hieu va ((cac du) or (cac bac)) ban hanh gia cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((x hoi) OR (xa hoi)). hieu va ((cac du) OR (cac bac)) ban hanh gia cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((x hoi) or (xa hoi)). hieu va ((cac du) or (cac bac)) ban hanh gia cua tre*.