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 series." » "arten des mobile communication services.", "arten des mobile communication systems.", "arten des mobile communication skills.", "arten does mobile communication series.", "arten das mobile communication series.", "arten less mobile communication series.", "arten der mobile communication series.", "akten des mobile communication series."

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