Perhaps you should try some spelling variations:
"so sach tren phuong trinh khoa phau thong" » "so sach tren chuong trinh khoa phau thong", "so sach tren cong trinh khoa phau thong", "so sach tren huong tran khoa phau thong", "so sach trien phuong trinh khoa phau thong", "so sach tran phuong trinh khoa phau thong", "so sach ren phuong trinh khoa phau thong", "so sach tren phuong trinh hoa phau thong", "so sach tren phuong sinh khoa phau thong", "so sach tren phuong trinh hoi phau thong", "so sach tren phuong trinh khoa phap thong", "so sach tren phuong trinh khoa khau thong", "so sach tren phuong trinh khoa phan thong", "so sach tien phuong trinh khoa phau thong", "so sach tranh phuong trinh khoa phau thong", "so sach tren phuong trinh hoa phan thong", "so sach tren phuong trinh khoa kham thong", "so sach tren phuong trinh khoa thu thong", "so sanh tren phuong trinh khoa phau thong", "bo sach tren phuong trinh khoa phau thong", "co sach tren phuong trinh khoa phau thong"
"tu sach tin hoc bai khoa than thong" » "tu sach tin hoc bai khoa than thuong", "tu sach tin hoc bai khoa toan thong", "tu sach tin hoc bai khoa tran thong", "tu sach tin hoc bai khoa luan thong", "tu sach tin hoc bai hoa thai thong", "tu sach tin hoc bai hoa tan thong", "tu sach tien hoc bai khoa than thong", "tu sach kinh hoc bai khoa than thong", "tu sach han hoc bai khoa than thong", "tu sach tin hoc tai khoa than thong", "tu sach tin hoc dai khoa than thong", "tu sach tin hoc mai khoa than thong", "thu sach tin hoc bai khoa than thong", "su sach tin hoc bai khoa than thong", "te sach tin hoc bai khoa than thong", "tu sach sinh hoc bai khoa than thong", "tu sach tin hoc giai khoa than thong"

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: (("so sach tren phuong trinh khoa phau thong") or ("tu sach tin hoc bai khoa than thong"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("so sach tren phuong trinh khoa phau thong") OR ("tu sach tin hoc bai khoa than thong")).
• Removing quotes may allow a broader search: (( so sach tren phuong trinh khoa phau thong ) or ( tu sach tin hoc bai khoa than thong )).
• Adding a wildcard symbol may retrieve word variants: (("so sach tren phuong trinh khoa phau thong") or ("tu sach tin hoc bai khoa than thong"))*.