Perhaps you should try some spelling variations:
"toc sach phan le giai toan thong minh" » "toc sach phan le giai toan thong tin", "toc sach han le giai toan thong minh", "toc mach phan le giai toan thong minh", "toc sach phat le giai toan thong minh", "toc sach phan le giai doan thong minh", "toc sach phan le giai toa thong minh", "toc sach phan le gioi toan thong minh", "hoc sach phan le giai toan thong minh", "doc sach phan le giai toan thong minh", "thuoc sach phan le giai toan thong minh", "toc sach pham le giai toan thong minh", "toc sach phan mem giai toan thong minh", "toc sach phan lap giai toan thong minh", "toc sach phan de giai toan thong minh", "toc sach phan ly giai toan thong minh", "toc sach phan ve giai toan thong minh"
"vu bach ha ke nguoi cong hoang minh" » "vu bach ha ke nguoi muong hoang minh", "vu bach ha ke nguoi thong hoang minh", "vu bach ha ke nguoi nung hoang minh", "vu bach ha ke nguoi cong hoan minh", "vu bach ha ke nguoi vuong hoang minh", "vu bach ha le nguoi cong hoang minh", "vu bach ha ky nguoi cong hoang minh", "vu bach ha me nguoi cong hoang minh", "vu bac ha ke nguoi cong hoang minh", "vu bich ha ke nguoi cong hoang minh", "vu sach ha ke nguoi cong hoang minh", "vu bach hat ke nguoi cong hoang minh", "vu bach kha ke nguoi cong hoang minh"

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: (("toc sach phan le giai toan thong minh") or ("vu bach ha ke nguoi cong hoang minh"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("toc sach phan le giai toan thong minh") OR ("vu bach ha ke nguoi cong hoang minh")).
• Removing quotes may allow a broader search: (( toc sach phan le giai toan thong minh ) or ( vu bach ha ke nguoi cong hoang minh )).
• Adding a wildcard symbol may retrieve word variants: (("toc sach phan le giai toan thong minh") or ("vu bach ha ke nguoi cong hoang minh"))*.