Perhaps you should try some spelling variations:
"su sach cha me gioi co thong minh" » "su sach cha me gioi co thong tin", "su sach cha me gioi co hoang minh", "su sach nha me gioi co thong minh", "su sach che me gioi co thong minh", "su sach ha me gioi co thong minh", "su sach cha me gioi bo thong minh", "su sach cha me gioi co trong minh", "su sach cha me gioi co phong minh", "so sach cha me gioi co thong minh", "vu sach cha me gioi co thong minh", "su sach cha me giai co thong minh", "su sach cha ve gioi co thong minh", "su sach cha me nguoi co thong minh"
"thu sach han de giai cong cong trinh" » "thu sach han de gia cong cong trinh", "thu sach han de giao cong cong trinh", "thu sach han de giai phong cong trinh", "thu sach han de giai cong dong trinh", "thu sach han de giai trong cong trinh", "thu sach han de giai dung cong trinh", "tu sach han de giai cong cong trinh", "thuat sach han de giai cong cong trinh", "thuoc sach han de giai cong cong trinh", "thu sach tham de giai cong cong trinh", "thu sach danh de giai cong cong trinh", "thu sach nang de giai cong cong trinh", "thu sach han dan giai cong cong trinh", "thu sach han kem giai cong cong trinh", "thu sach hanh de giai cong cong trinh", "thu sach van de giai cong cong trinh", "thu sach han du giai cong cong trinh"

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: (("thu sach han de giai cong cong trinh") or ("su sach cha me gioi co thong minh"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("thu sach han de giai cong cong trinh") OR ("su sach cha me gioi co thong minh")).
• Removing quotes may allow a broader search: (( thu sach han de giai cong cong trinh ) or ( su sach cha me gioi co thong minh )).
• Adding a wildcard symbol may retrieve word variants: (("thu sach han de giai cong cong trinh") or ("su sach cha me gioi co thong minh"))*.