Perhaps you should try some spelling variations:
"te sach xa ve giai cong phuong trinh" » "te sach xa ve giai cong chuong trinh", "te sach xa ve giai cong cong trinh", "te sach xa ve giai cong huong tran", "te sach xa ve giai cong thuong trinh", "te sach xa ve giai cong huong trinh", "te sach xa ve giai dong phuong trinh", "te sach xa ve gia cong phuong trinh", "te sach xa ve giao cong phuong trinh", "te sach xa ve giai phong phuong trinh", "toc sach xa ve giai cong phuong trinh", "te sach dao ve giai cong phuong trinh", "te sach bai ve giai cong phuong trinh", "te sach xa va giai cong phuong trinh", "te sach xa de giai cong phuong trinh", "te sach ca ve giai cong phuong trinh", "te sach va ve giai cong phuong trinh", "te sach la ve giai cong phuong trinh"
"su sach nha ve gian song thong tin" » "su sach nha ve gian song thuong tin", "su sach nha ve gian song hong tin", "su sach nha ve gian dong thong tin", "su sach nha ve gian trong thong tin", "su sach nha ve gian muong thong tin", "su sach nha ve gian lang thong tin", "so sach nha ve gian song thong tin", "vu sach nha ve gian song thong tin", "su sach nha ve giao song thong tin", "su sach nha va gian song thong tin", "su sach nha va gianh song thong tin", "su sach nhat ve gian song thong tin", "su sach nhan ve gian song thong tin", "su sach nha ve gian song thong tinh"

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: (("te sach xa ve giai cong phuong trinh") or ("su sach nha ve gian song thong tin"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("te sach xa ve giai cong phuong trinh") OR ("su sach nha ve gian song thong tin")).
• Removing quotes may allow a broader search: (( te sach xa ve giai cong phuong trinh ) or ( su sach nha ve gian song thong tin )).
• Adding a wildcard symbol may retrieve word variants: (("te sach xa ve giai cong phuong trinh") or ("su sach nha ve gian song thong tin"))*.