Perhaps you should try some spelling variations:
"routledge telecommunication system." » "routledge communication system.", "mobile telecommunication system.", "contents telecommunication system.", "routledge telecommunication systems.", "routledge telecommunication services.", "routledge telecommunication union."
"routledge telecommunication sector." » "routledge communication sector.", "mobile telecommunication sector.", "contents telecommunication sector.", "routledge telecommunications sector.", "routledge telecommunication systems.", "routledge telecommunication services."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("routledge telecommunication system.") or ("routledge telecommunication sector."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("routledge telecommunication system.") OR ("routledge telecommunication sector.")).
• Removing quotes may allow a broader search: (( routledge telecommunication system. ) or ( routledge telecommunication sector. )).
• Adding a wildcard symbol may retrieve word variants: (("routledge telecommunication system.") or ("routledge telecommunication sector."))*.