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