Perhaps you should try some spelling variations:
"mobile telecommunications agencies." » "mobile telecommunications policies.", "mobile telecommunications services.", "mobile telecommunications access.", "mobile telecommunication agencies.", "mobile communications agencies.", "mobile communication agencies."
"mobile telecommunications series." » "mobile telecommunication series.", "mobile communications series.", "mobile communication series.", "mobile telecommunications services.", "mobile telecommunication services.", "mobile telecommunications service."

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

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