Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tinh vai » tinh va, tinh hai, tinh bai
vai cua » dai cua, hai cua, lai cua
cac ban » cac dan, cac van, can ban
cuc ban » cua ban, cuu ban, duc ban
dang xa » dang xay, lang xa, dang ha
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cao, va cai

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 _ dang xa hoi. hieu ((va cam) OR (va cac)) ((cuc ban) or (cac ban)) tinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach _ dang xa hoi. hieu ((va cam) OR (va cac)) ((cuc ban) OR (cac ban)) tinh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach _ dang xa hoi. hieu ((va cam) OR (va cac)) ((cuc ban) or (cac ban)) tinh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach _ dang xa hoi. hieu ((va cam) OR (va cac)) ((cuc ban) or (cac ban)) tinh vai cua tre*.