Perhaps you should try some spelling variations:
"su sach ba me giai co thong minh" » "su sach ba me giai co thong tin", "su sach ba me giai co hoang minh", "su sach ba me giai bo thong minh", "su sach ba me giai co trong minh", "su sach ba me giai co phong minh", "so sach ba me giai co thong minh", "vu sach ba me giai co thong minh", "su sach bai me giai co thong minh", "su sach bac me giai co thong minh", "su sach bao me giai co thong minh", "su sach ba de giai co thong minh", "su sach ba ve giai co thong minh", "su sach ba ke giai co thong minh", "su sach ba me giai cao thong minh", "su sach ba me gian co thong minh", "su sach ba me gioi co thong minh"
"vu bach ha me giup hoc dung ninh" » "vu bach ha me giup hoc dung vinh", "vu bach ha me giup hoc quang ninh", "vu bach ha me giup hoc dung nen", "vu bach ha me giup xac dung ninh", "vu bach ha me giup hoc ung ninh", "vu bach ha me giup hoc dan ninh", "vu bach ha me giup tac dung ninh", "vu bac ha me giup hoc dung ninh", "vu bich ha me giup hoc dung ninh", "vu sach ha me giup hoc dung ninh", "vu bach ha tue giup hoc dung ninh", "vu bach ha moi giup hoc dung ninh", "vu bach cha me giup hoc dung ninh", "vu bach ha le giup hoc dung ninh", "vu bach ca me giup hoc dung ninh"

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 ba me giai co thong minh") or ("vu bach ha me giup hoc dung ninh"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su sach ba me giai co thong minh") OR ("vu bach ha me giup hoc dung ninh")).
• Removing quotes may allow a broader search: (( su sach ba me giai co thong minh ) or ( vu bach ha me giup hoc dung ninh )).
• Adding a wildcard symbol may retrieve word variants: (("su sach ba me giai co thong minh") or ("vu bach ha me giup hoc dung ninh"))*.