Perhaps you should try some spelling variations:
ban hang » ngan hang
hieu ban » hieu van, dieu ban, lieu ban
thanh ve » hanh ve, thanh va, thanh vien
duoc va » duc va, duoc ma, duong va
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te cua
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 ty nang ((x hoi) or (xa hoi)). hieu ban hang ((duoc va) or (nuoc va)) thanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((x hoi) OR (xa hoi)). hieu ban hang ((duoc va) OR (nuoc va)) thanh ve cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((x hoi) or (xa hoi)). hieu ban hang ((duoc va) or (nuoc va)) thanh ve cua tre*.