Perhaps you should try some spelling variations:
ban hang » ngan hang
qua cam » qua cham, qua cac, qua ca
vai cua » dai cua, hai cua, lai cua
van anh » van thanh, tuan anh, van minh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
tang xa » trang xa, lang xa, tang ha
cua tre » cua te, cuu tre, cua triet

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