Perhaps you should try some spelling variations:
"micro and nano technologies serious" » "micro and nano technologies services", "micro and nano technologies sensors", "micro and nano methodologies serious", "micro and nanotechnologies _ serious", "micro and nano technology serious"
"Micro and nano technologies social" » "Micro and nano technologies signal", "Micro and nano technology social", "Micro and nanotechnologies _ social"
"micro and nano technologies select" » "micro and nano technologies smart", "micro and nanotechnologies _ select", "micro and nano technology select"
"Micro and nano technologies second" » "Micro and nanotechnologies _ second", "Micro and nano technology second"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("micro and nano technologies serious") OR ((((("Micro and nano technologies second") OR ("Micro and nano technologies social"))) OR ("micro and nano technologies select")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"micro and nano technologies serious\") or (((((\"Micro and nano technologies second\") OR (\"Micro and nano technologies social\"))) or (\"micro and nano technologies select\"))))".
• Removing quotes may allow a broader search: (( micro and nano technologies serious ) or ((((( Micro and nano technologies second ) OR ( Micro and nano technologies social ))) or ( micro and nano technologies select )))).
• Adding a wildcard symbol may retrieve word variants: (("micro and nano technologies serious") or ((((("Micro and nano technologies second") OR ("Micro and nano technologies social"))) or ("micro and nano technologies select"))))*.