Perhaps you should try some spelling variations:
carlos sobral » carlos souza (Expand Search), carlos soares (Expand Search), carlos seabra (Expand Search)
onset complex » onset complexo (Expand Search), onset complete (Expand Search)
complex trex » complex tree (Expand Search), complex tetrex (Expand Search), complex tric (Expand Search)
kcl carlos » akel carlos (Expand Search), gil carlos (Expand Search), del carlos (Expand Search)
0.9 nacl » 3.5 nacl (Expand Search)
l combs » e combs (Expand Search), _ combs (Expand Search), l comps (Expand Search)
combs c » combs _ (Expand Search)
5 onset » _ onset (Expand Search), 2 onset (Expand Search), 1 onset (Expand Search)
c net » c neto (Expand Search), _ net (Expand Search), u net (Expand Search)
ngos » ngs (Expand Search), ngo (Expand Search), ngoc (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 l combs c net ) OR ((( 5 onset complex trex ngos ) OR ( 0.9 nacl kcl carlos sobral ))))~.
• Adding a wildcard symbol may retrieve word variants: (( j l combs c net ) or ((( 5 onset complex trex ngos ) or ( 0.9 nacl kcl carlos sobral ))))*.