Perhaps you should try some spelling variations:
"tu sach cha me giai nam chuong trinh" » "tu sach cha me giai nam cong trinh", "tu sach cha me giai nam phuong trinh", "tu sach cha me giai nam cuong trinh", "tu sach cha me giai pham chuong trinh", "tu sach nha me giai nam chuong trinh", "tu sach che me giai nam chuong trinh", "tu sach ha me giai nam chuong trinh", "tu sach cha me giai nan chuong trinh", "tu sach cha me gian nam chuong trinh", "tu sach cha me giai bai chuong trinh", "thu sach cha me giai nam chuong trinh", "te sach cha me giai nam chuong trinh", "tu cach cha me giai nam chuong trinh", "tu sach cha ve giai nam chuong trinh", "tu sach cha ke giai nam chuong trinh", "tu sach cha le giai nam chuong trinh"
"su sach phat de giai ban thong minh" » "su sach phat de giai ban thong tin", "su sach phat de giai ban hoang minh", "su sach nha de giai ban thong minh", "su sach tham de giai ban thong minh", "su cach pha de giai ban thong minh", "su sach phat de giai ban trong minh", "su sach phat de giai ban tuong minh", "su sach phat de giai ban tong minh", "su sach phat de giai bai thong minh", "su sach phat de giai han thong minh", "su sach phat de giai san thong minh", "so sach phat de giai ban thong minh", "vu sach phat de giai ban thong minh", "su sach nhat de giai ban thong minh", "su sach hat de giai ban thong minh", "su sach phat dien giai ban thong minh", "su sach phat dan giai ban thong minh", "su sach phat kem giai ban thong minh"

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