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

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