Perhaps you should try some spelling variations:
"telecommunication sector activityin." » "telecommunications sector activityin.", "telecommunication systems activityin.", "telecommunication services activityin.", "telecommunication sector activity.", "telecommunication sector activities.", "telecommunication system activityin."
"telecommunication system active." » "telecommunication systems active.", "telecommunication services active.", "telecommunication union active.", "telecommunication system achieve.", "telecommunication system activity.", "telecommunication system passive."

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

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