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