Perhaps you should try some spelling variations:
ban thanh » ban hanh
thu sach » tu sach, thuat sach, thuoc sach
ban hang » ngan hang
lai cuu » lai cua, lai chau, lai cuoc
cuu tre » cua tre, cau tren, cau treo
lang xa » lang ha, dang xay, lang van
sach o » sach lo, sac o, sach y
va cam » va cham, va cac, va cai
o lang » hoa lang, hoi lang
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach o lang xa hoi. hieu ((va cam) OR (va cao)) qua ((ban thanh) or (ban hang)) lai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach o lang xa hoi. hieu ((va cam) OR (va cao)) qua ((ban thanh) OR (ban hang)) lai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach o lang xa hoi. hieu ((va cam) OR (va cao)) qua ((ban thanh) or (ban hang)) lai cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach o lang xa hoi. hieu ((va cam) OR (va cao)) qua ((ban thanh) or (ban hang)) lai cuu tre*.