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

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

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