Perhaps you should try some spelling variations:
"su sach cha le giai dan phuong trinh" » "su sach cha le giai dan chuong trinh", "su sach cha le giai dan cong trinh", "su sach cha le giai dan huong tran", "su sach cha le giai doan phuong trinh", "su sach cha le giai van phuong trinh", "su sach cha le giai lan phuong trinh", "su sach che le giai dan phuong trinh", "su sach ha le giai dan phuong trinh", "su sach cua le giai dan phuong trinh", "su sach cha le gian dan phuong trinh", "su sach cha le giai han phuong trinh", "so sach cha le giai dan phuong trinh", "vu sach cha le giai dan phuong trinh", "su sach cha de giai dan phuong trinh", "su sach cha ly giai dan phuong trinh", "su sach cha ve giai dan phuong trinh", "su sach cha me giai dan phuong trinh"
"te sach nha deo hai nam thong minh" » "te sach nha deo hai nam thong tin", "te sach nha deo hai nam hoang minh", "te sach nha deo hai nam trong minh", "te sach nha deo hai nam thang minh", "te sach nha deo hai nam phong minh", "toc sach nha deo hai nam thong minh", "te sach nha dieu hai nam thong minh", "te sach chat deo hai nam thong minh", "te sach nha do hai nam thong minh", "te sach nha dao hai nam thong minh", "te sach nha deo ha nam thong minh", "te sach nha 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 nha deo hai nam thong minh") OR ("su sach cha le giai dan phuong trinh"))~.
• Removing quotes may allow a broader search: (( te sach nha deo hai nam thong minh ) or ( su sach cha le giai dan phuong trinh ))~.
• Adding a wildcard symbol may retrieve word variants: (("te sach nha deo hai nam thong minh") or ("su sach cha le giai dan phuong trinh"))*.