Perhaps you should try some spelling variations:
metal complex » metal complexes (Expand Search)
complex tail » complex task (Expand Search), complex thin (Expand Search), complex tap (Expand Search)
carlos nojek » carlos nunez (Expand Search), carlos nunes (Expand Search), carlos nejar (Expand Search)
nano carlos » cano carlos (Expand Search), nino carlos (Expand Search), nuno carlos (Expand Search)
comes con » comes can (Expand Search), comes down (Expand Search), comes joan (Expand Search)
nacl nano » nacl kno (Expand Search), nacl nabr (Expand Search), nacl naoh (Expand Search)
tail can » trail can (Expand Search), nail can (Expand Search), tail ca (Expand Search)
l comes » l comps (Expand Search), l coles (Expand Search), l comas (Expand Search)
con noe » con note (Expand Search), con node (Expand Search), con nee (Expand Search)
5 metal » 5 methyl (Expand Search)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( j l comes con noe ) or ((( 5 metal complex tail can ) or ( 3.5 nacl nano carlos nojek ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( j l comes con noe ) OR ((( 5 metal complex tail can ) OR ( 3.5 nacl nano carlos nojek )))).
• Adding a wildcard symbol may retrieve word variants: (( j l comes con noe ) or ((( 5 metal complex tail can ) or ( 3.5 nacl nano carlos nojek ))))*.