Perhaps you should try some spelling variations:
"so sach nha viet giao do hong minh" » "so sach nha viet giao do hoang minh", "so sach nha viet giao do thong minh", "so sach nha viet giao do khong minh", "so sach nhan viet giao do hong minh", "so sach nhat viet giao do hong minh", "so sach na viet giao do hong minh", "so sanh nha viet giao do hong minh", "bo sach nha viet giao do hong minh", "co sach nha viet giao do hong minh", "so sach nha viet gia do hong minh", "so sach nha viet giac do hong minh", "so sach nha viet giao o hong minh", "so sach nha viet giao do luong minh"
"te sach cha van giai can thong tin" » "te sach cha van giai ban thong tin", "te sach cha van giai van thong tin", "te sach cha van giai chan thuong tin", "te sach che van giai can thong tin", "te sach ha van giai can thong tin", "te sach cua van giai can thong tin", "te sach cha va giai can thong tin", "te sach cha dan giai can thong tin", "te sach cha van giao can thong tin", "te sach cha van giai han thong tin", "te sach cha van giai san thong tin", "te sach cha van giai ca thong tin", "toc sach cha van giai can thong tin", "te sach chao van giai can thong tin", "te sach chau van giai can thong tin", "te sach chat van giai can 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: (("te sach cha van giai can thong tin") or ("so sach nha viet giao do hong minh"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("te sach cha van giai can thong tin") OR ("so sach nha viet giao do hong minh")).
• Removing quotes may allow a broader search: (( te sach cha van giai can thong tin ) or ( so sach nha viet giao do hong minh )).
• Adding a wildcard symbol may retrieve word variants: (("te sach cha van giai can thong tin") or ("so sach nha viet giao do hong minh"))*.