Perhaps you should try some spelling variations:
"artech house _ telecommunication services." » "artech house _ telecommunications services.", "artech house _ communication services."
"artech more mobile communication series." » "artech more mobile communication services.", "artech more mobile communication systems.", "artech more mobile communication skills."

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