Perhaps you should try some spelling variations:
ban hang » ngan hang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
qua cam » qua cham, qua cac, qua ca
va hanh » van hanh, va thanh, va danh
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren

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 qua cam xuc ((va hanh) or (ban hang)) dinh ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu qua cam xuc ((va hanh) OR (ban hang)) dinh ((cuu tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu qua cam xuc ((va hanh) or (ban hang)) dinh ((cuu tre) or (cua tre))*.