Perhaps you should try some spelling variations:
"artech does _ telecommunications series." » "artech does _ telecommunications services.", "artech does _ telecommunication services.", "artech does _ telecommunications service.", "artech house _ telecommunications series."
"arten des mobile communication services." » "arten des mobile telecommunications services.", "arten does mobile communication services.", "arten das mobile communication services.", "arten less mobile communication services.", "arten der mobile communication services.", "akten des mobile communication services."

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: (("artech does _ telecommunications series.") or ("arten des mobile communication services."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("artech does _ telecommunications series.") OR ("arten des mobile communication services.")).
• Removing quotes may allow a broader search: (( artech does _ telecommunications series. ) or ( arten des mobile communication services. )).
• Adding a wildcard symbol may retrieve word variants: (("artech does _ telecommunications series.") or ("arten des mobile communication services."))*.