Perhaps you should try some spelling variations:
"te sach mang may thuat toan khoa" » "te cach mang may thuat toan khoa", "te hoach mang may thuat toan khoa", "te sach quang may thuat toan khoa", "te sach mang my thuat toan khoa", "te sach mang ma thuat toan khoa", "te sach mang va thuat toan khoa", "toc sach mang may thuat toan khoa", "te sach mang may thuat tran khoa"
"tu sach nang ky thuat mo hoc" » "tu cach mang ky thuat mo hoc", "tu sach dung ky thuat mo hoc", "tu sach danh ky thuat mo hoc", "tu sach nang ky thuat moi hoc", "tu sach nang ky thuat do hoc", "tu sach nang ky thuat o hoc", "thu sach nang ky thuat mo hoc", "su sach nang ky thuat mo hoc", "tu cach nang ky thuat mo hoc", "tu sach dang ky thuat mo hoc", "tu sach nang y thuat mo hoc", "tu sach tang ky thuat mo hoc", "tu sach nang ky thuat mon hoc", "tu sach nang ky thuat co hoc"

You may be able to get more results by adjusting your search query.

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