Perhaps you should try some spelling variations:
"thuoc sach dinh cu - so giao" » "hoc sach dinh cu - so giao", "nuoc sach dinh cu - so giao", "thuat sach dinh cu - so giao", "thuoc sach kinh cu - so giao", "thuoc sach danh cu - so giao", "thuoc hoach dinh cu - so giao", "thuoc sach dinh cuu - so giao", "thuoc sach dinh chuc - so giao", "thuoc sach dinh chau - so giao", "thuoc sach dinh cu - so giai", "thuoc sach dinh cu - hoc giao"
"su sach hinh su - toan giao" » "su sach kinh su - toan giao", "su sach danh su - toan giao", "su sach han su - toan giao", "su sach hinh su - ton giao", "su sach hinh su - toan cao", "su sach hinh su - hoa giao", "so sach hinh su - toan giao", "vu sach hinh su - toan giao"

Try widening your search to All Fields.

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 hinh su - toan giao") or ("thuoc sach dinh cu - so giao"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su sach hinh su - toan giao") OR ("thuoc sach dinh cu - so giao")).
• Removing quotes may allow a broader search: (( su sach hinh su - toan giao ) or ( thuoc sach dinh cu - so giao )).
• Adding a wildcard symbol may retrieve word variants: (("su sach hinh su - toan giao") or ("thuoc sach dinh cu - so giao"))*.