Perhaps you should try some spelling variations:
"su sach cha ly giai san phuong trinh" » "su sach cha ly giai san chuong trinh", "su sach cha ly giai san cong trinh", "su sach cha ly giai san huong tran", "su sach cha ly giai van phuong trinh", "su sach cha ly giai dan phuong trinh", "su sach cha ly giai lan phuong trinh", "su sach nha ly giai san phuong trinh", "su sach che ly giai san phuong trinh", "su sach ha ly giai san phuong trinh", "su sach cha ly giai han phuong trinh", "su sach cha ly giai doan phuong trinh", "su sach cha ly giang san phuong trinh", "so sach cha ly giai san phuong trinh", "vu sach cha ly giai san phuong trinh", "su sach cha loi giai san phuong trinh", "su sach cua ly giai san phuong trinh"
"te sach hat deo hai nam thong minh" » "te sach hat deo hai nam thong tin", "te sach hat deo hai nam hoang minh", "te sach hat deo hai nam trong minh", "te sach hat deo hai nam thang minh", "te sach hat deo hai nam phong minh", "te sach phat deo hai nam thong minh", "te sach dat deo hai nam thong minh", "te sach han deo hai nam thong minh", "toc sach hat deo hai nam thong minh", "te sach chat deo hai nam thong minh", "te sach hat dao hai nam thong minh", "te sach hat de hai nam thong minh", "te sach hat do hai nam thong minh", "te sach hat deo ha nam thong minh", "te sach hat deo loai nam thong minh"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("te sach hat deo hai nam thong minh") OR ("su sach cha ly giai san phuong trinh"))~.
• Removing quotes may allow a broader search: (( te sach hat deo hai nam thong minh ) or ( su sach cha ly giai san phuong trinh ))~.
• Adding a wildcard symbol may retrieve word variants: (("te sach hat deo hai nam thong minh") or ("su sach cha ly giai san phuong trinh"))*.