Perhaps you should try some spelling variations:
"su sach xa ke giao cong thong minh" » "su sach xa ke giao cong thuong minh", "su sach xa ke giao cong trong minh", "su sach xa ke giao dong thong minh", "su sach xa ke giao cong hoang minh", "su sach xa ke gia cong thong minh", "su sach xa ke giao thong thong minh", "su sach xa ke cao cong thong minh", "so sach xa ke giao cong thong minh", "vu sach xa ke giao cong thong minh", "su sach dao ke giao cong thong minh", "su sach nha ke giao cong thong minh", "su sach bai ke giao cong thong minh", "su sach xa te giao cong thong minh", "su sach xa ve giao cong thong minh", "su sach xa khoe giao cong thong minh", "su sach va ke giao cong thong minh", "su sach ba ke giao cong thong minh", "su sach ca ke giao cong thong minh"
"thu bach ha de giai toan thong tin" » "thu bach ha de giai doan thong tin", "thu bach ha de giai toa thong tin", "thu bach ha de gioi toan thong tin", "thi bach ha de giai toan thong tin", "thu sach ha de giai toan thong tin", "thu hoach ha de giai toan thong tin", "thu bac ha de giai toan thong tin", "thu bich ha de giai toan thong tin", "thu bach ha dan giai toan thong tin", "thu bach ha kem giai toan thong tin", "thu bach hac de giai toan thong tin", "thu bach hat de giai toan thong tin", "thu bach va de giai toan thong tin"

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 bach ha de giai toan thong tin") or ("su sach xa ke giao cong thong minh"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("thu bach ha de giai toan thong tin") OR ("su sach xa ke giao cong thong minh")).
• Removing quotes may allow a broader search: (( thu bach ha de giai toan thong tin ) or ( su sach xa ke giao cong thong minh )).
• Adding a wildcard symbol may retrieve word variants: (("thu bach ha de giai toan thong tin") or ("su sach xa ke giao cong thong minh"))*.