Perhaps you should try some spelling variations:
"thu canh trinh kxy thuat van hoc" » "thu canh tranh kxy thuat van hoc", "thu hanh trinh kxy thuat van hoc", "thu canh tinh kxy thuat van hoc", "thu canh trinh ky thuat van hoc", "thu canh trinh ly thuat van hoc", "thu canh trinh ke thuat van hoc", "thu canh trinh ki thuat van hoc", "thu canh trinh my thuat van hoc", "thu canh trinh ky thua van hoc", "thu canh trinh kxy thuat san hoc", "thu canh trinh kxy thuat va hoc", "thu canh trinh kxy thuat ban hoc", "thuc hanh trinh kxy thuat van hoc", "thu cong trinh kxy thuat van hoc", "thu ban trinh kxy thuat van hoc", "thu canh trinh kxy thuat van hoa"
"tu sach ngan ky thuat do hoc" » "tu sach ngon ky thuat do hoc", "tu sach nha ky thuat do hoc", "tu sach han ky thuat do hoc", "tu sach ngan ky thuat o hoc", "thu sach ngan ky thuat do hoc", "su sach ngan ky thuat do hoc", "te sach ngan ky thuat do hoc", "tu sach nganh ky thuat do hoc", "tu sach nhan ky thuat do hoc", "tu sach ngan hay thuat do hoc", "tu sach ngan ky thuat co hoc", "tu sach ngan ky thuat do hoa", "tu sach ngan ky thuat du hoc"

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 do hoc") or ("thu canh trinh kxy thuat van hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("tu sach ngan ky thuat do hoc") OR ("thu canh trinh kxy thuat van hoc")).
• Removing quotes may allow a broader search: (( tu sach ngan ky thuat do hoc ) or ( thu canh trinh kxy thuat van hoc )).
• Adding a wildcard symbol may retrieve word variants: (("tu sach ngan ky thuat do hoc") or ("thu canh trinh kxy thuat van hoc"))*.