Perhaps you should try some spelling variations:
"toc sach xa ve cua cong thong minh" » "toc sach xa ve cua cong thuong minh", "toc sach xa ve cua cong trong minh", "toc sach xa ve cua dong thong minh", "toc sach xa ve cua cong hoang minh", "doc sach xa ve cua cong thong minh", "thuoc sach xa ve cua cong thong minh", "nuoc sach xa ve cua cong thong minh", "toc sach dao ve cua cong thong minh", "toc sach nha ve cua cong thong minh", "toc sach bai ve cua cong thong minh", "toc sach xa le cua cong thong minh", "toc sach xa de cua cong thong minh", "toc sach xa te cua cong thong minh", "toc sach ca ve cua cong thong minh", "toc sach va ve cua cong thong minh", "toc sach la ve cua cong thong minh"
"hoc sach han me gioi cong thong tin" » "hoc sach han me gioi cong thuong tin", "hoc sach han me gioi cong trong tin", "hoc sach han me gioi dong thong tin", "hoc sach han me gioi song thong tin", "hoc sach han me nguoi cong thong tin", "hoc sinh han me gioi cong thong tin", "hoc cac han me gioi cong thong tin", "hoc anh han me gioi cong thong tin", "hoc sach tham me gioi cong thong tin", "hoc sach danh me gioi cong thong tin", "hoc sach nang me gioi cong thong tin", "hoc sach han me giai cong thong tin", "hoc sach han ve gioi cong thong tin", "hoc sach phan mem gioi cong thong tin", "hoc sach han me gioi cong 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: (("toc sach xa ve cua cong thong minh") or ("hoc sach han me gioi cong thong tin"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("toc sach xa ve cua cong thong minh") OR ("hoc sach han me gioi cong thong tin")).
• Removing quotes may allow a broader search: (( toc sach xa ve cua cong thong minh ) or ( hoc sach han me gioi cong thong tin )).
• Adding a wildcard symbol may retrieve word variants: (("toc sach xa ve cua cong thong minh") or ("hoc sach han me gioi cong thong tin"))*.