Perhaps you should try some spelling variations:
"so sach nganh y thuat toan khoa" » "so sach ngan y thuat toan khoa", "so cac nganh y thuat toan khoa", "so sach danh y thuat toan khoa", "so sanh nganh y thuat toan khoa", "bo sach nganh y thuat toan khoa", "co sach nganh y thuat toan khoa", "so sach nganh my thuat toan khoa", "so sach nganh kxy thuat toan khoa", "so sach nganh ki thuat toan khoa", "so sach nganh y thuat tran khoa"
"so sach tranh ky thuat toan khoa" » "so canh tranh ky thuat toan khoa", "so sach trinh ky thuat toan khoa", "so sach thanh ky thuat toan khoa", "so sach hanh ky thuat toan khoa", "so sanh tranh ky thuat toan khoa", "bo sach tranh ky thuat toan khoa", "co sach tranh ky thuat toan khoa", "so sach tranh kmy thuat toan khoa", "so sach tranh kkxy thuat toan khoa", "so sach tranh kki thuat toan khoa", "so sach tranh ky thuat tran khoa"

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: (("so sach nganh y thuat toan khoa") or ("so sach tranh ky thuat toan khoa"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("so sach nganh y thuat toan khoa") OR ("so sach tranh ky thuat toan khoa")).
• Removing quotes may allow a broader search: (( so sach nganh y thuat toan khoa ) or ( so sach tranh ky thuat toan khoa )).
• Adding a wildcard symbol may retrieve word variants: (("so sach nganh y thuat toan khoa") or ("so sach tranh ky thuat toan khoa"))*.