Perhaps you should try some spelling variations:
"tu sach ngan ky thuat toan hoc" » "tu sach ngon ky thuat toan hoc", "tu sach nha ky thuat toan hoc", "tu sach han ky thuat toan hoc", "tu sach ngan ky thuat toan khoa", "tu sach ngan ky thuat hoa hoc", "tu sach ngan ky thuat tin hoc", "thu sach ngan ky thuat toan hoc", "su sach ngan ky thuat toan hoc", "te sach ngan ky thuat toan hoc", "tu sach nganh ky thuat toan hoc", "tu sach nhan ky thuat toan hoc", "tu sach ngan hay thuat toan hoc"
"tu canh tranh my thuat van hoc" » "tu canh tranh my thuat san hoc", "tu canh tranh my thuat va hoc", "tu canh tranh my thuat ban hoc", "tu canh trinh my thuat van hoc", "tu canh tran sy thuat van hoc", "tu canh anh my thuat van hoc", "tu canh tranh ki thuat van hoc", "tu canh tranh va thuat van hoc", "thu canh tranh my thuat van hoc", "tu chanh tranh my thuat van hoc", "tu can tranh my thuat van hoc", "tu canh tranh my thuat van hoa"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("tu sach ngan ky thuat toan hoc") or ("tu canh tranh my thuat van hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("tu sach ngan ky thuat toan hoc") OR ("tu canh tranh my thuat van hoc")).
• Removing quotes may allow a broader search: (( tu sach ngan ky thuat toan hoc ) or ( tu canh tranh my thuat van hoc )).
• Adding a wildcard symbol may retrieve word variants: (("tu sach ngan ky thuat toan hoc") or ("tu canh tranh my thuat van hoc"))*.