Perhaps you should try some spelling variations:
quan anh » quan hanh, quang anh, tuan anh
ban hang » ngan hang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
cac xuc » cac nuoc, chat xuc, cac cuoc
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

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 lang xa hoi. hieu ve ((cac xuc) OR (cam xuc)) ((ban hang) or (quan anh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu ve ((cac xuc) OR (cam xuc)) ((ban hang) OR (quan anh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. hieu ve ((cac xuc) OR (cam xuc)) ((ban hang) or (quan anh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu ve ((cac xuc) OR (cam xuc)) ((ban hang) or (quan anh)) dai cua tre*.