Perhaps you should try some spelling variations:
"su sach dinh chau - so giao" » "su sach kinh chau - so giao", "su sach danh chau - so giao", "su hoach dinh chau - so giao", "su sach minh chau - so giao", "su sach tinh chat - so giao", "su sach dinh chi - so giao", "vu sach dinh chau - so giao", "su sach dinh chau - so giai"
"so sach tich su - hoc giao" » "so mach tich su - hoc giao", "so sach kinh su - hoc giao", "so suc tich su - hoc giao", "so sach tich su - hoc cao", "so sanh tich su - hoc giao", "bo sach tich su - hoc giao", "co sach tich su - hoc giao", "so sach lich su - hoc giao", "so sach tich du - hoc giao", "so sach tich so - hoc giao"

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