Perhaps you should try some spelling variations:
metals complex » metal complex (Expand Search), metals complexes (Expand Search), metals coupled (Expand Search)
complex tools » complex tool (Expand Search), complex tones (Expand Search), complex tears (Expand Search)
carlos nada » carlos nadaf (Expand Search), carlos nava (Expand Search), carlos nara (Expand Search)
comps con » compost con (Expand Search), comps los (Expand Search)
tools non » tool non (Expand Search), tools bone (Expand Search), tools can (Expand Search)
con note » con notas (Expand Search)
5 metals » 5 metal (Expand Search), 5 meters (Expand Search), 5 meta (Expand Search)
0.9 nacl » 3.5 nacl (Expand Search)
nacl e » nacl en (Expand Search), nacl _ (Expand Search), nacl a (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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( j m comps con note ) OR ((( 5 metals complex tools non ) OR ( 0.9 nacl e carlos nada ))))~.
• Adding a wildcard symbol may retrieve word variants: (( j m comps con note ) or ((( 5 metals complex tools non ) or ( 0.9 nacl e carlos nada ))))*.