Perhaps you should try some spelling variations:
"routledge telecommunications sectors." » "routledge communication sectors.", "house telecommunications sectors.", "mobile telecommunications sectors.", "routledge telecommunications sector.", "routledge telecommunication sector.", "routledge telecommunications operators."
"routledge telecommunications service." » "routledge communication service.", "house telecommunications service.", "mobile telecommunications service.", "routledge telecommunications services.", "routledge telecommunication services.", "routledge telecommunications provider."

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: (("routledge telecommunications sectors.") or ("routledge telecommunications service."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("routledge telecommunications sectors.") OR ("routledge telecommunications service.")).
• Removing quotes may allow a broader search: (( routledge telecommunications sectors. ) or ( routledge telecommunications service. )).
• Adding a wildcard symbol may retrieve word variants: (("routledge telecommunications sectors.") or ("routledge telecommunications service."))*.