Perhaps you should try some spelling variations:
"tu canh tranh ly thuat bang hoc" » "tu canh tranh ly thuat ban hoc", "tu canh tranh ly thuat mang hoc", "tu canh tranh ly thuat nang hoc", "tu canh trinh ly thuat bang hoc", "tu canh tranh lam thuat bang hoc", "tu canh doanh ly thuat bang hoc", "tu canh tranh my thuat bang hoc", "tu canh tranh ly thuyet bang hoc", "tu canh tranh kxy thuat bang hoc", "tu canh tranh ly thuat quang hoc", "thu canh tranh ly thuat bang hoc", "tu chanh tranh ly thuat bang hoc", "tu can tranh ly thuat bang hoc"
"te sach ngan ky thuat co hoc" » "te sach ngon ky thuat co hoc", "te sach nha ky thuat co hoc", "te sach han ky thuat co hoc", "te sach ngan ky thuat do hoc", "te sach ngan ky thuat o hoc", "toc sach ngan ky thuat co hoc", "te sach nganh ky thuat co hoc", "te sach nhan ky thuat co hoc", "te sach ngan hay thuat co hoc"

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