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

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 ((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 ((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 ((cuc ban) or (cac ban)) tinh vai cua tre*.