Perhaps you should try some spelling variations:
sach tham » sach nha
vinh cuu » dinh cuu, sinh cua, dinh cu
sach thu » sach thue, sach thieu, cach thuc
cac toi » cac thoi
qua cac » cua cac
cuu tre » cua tre, cau tren, cau treo
tang ma » mang may, tang van
ma hoi » mai hoi, xa hoi, ma hoa
ca dan » cac dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach thu) or (sach tham)) tang ma hoi. hieu qua cac toi ((ca dan) or (ca dao)) vinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach thu) OR (sach tham)) tang ma hoi. hieu qua cac toi ((ca dan) OR (ca dao)) vinh cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc ((sach thu) or (sach tham)) tang ma hoi. hieu qua cac toi ((ca dan) or (ca dao)) vinh cuu tre*.