Perhaps you should try some spelling variations:
complex trial » complex atrial (Expand Search), complex tibial (Expand Search), complex tropical (Expand Search)
oil complex » cell complex (Expand Search)
carlos nava » carlos navarro (Expand Search), carlos eslava (Expand Search), carlos zavala (Expand Search)
gil carlos » gil campos (Expand Search)
trial ngo » trial neo (Expand Search), trial new (Expand Search), trial nrg (Expand Search)
como new » combo new (Expand Search), como neo (Expand Search), como nexo (Expand Search)
nacl gil » nacl kcl (Expand Search), nacl gum (Expand Search), nacl i (Expand Search)
l campo » el campo (Expand Search), al campo (Expand Search), l campos (Expand Search)
5 oil » _ oil (Expand Search), l oil (Expand Search), 5 il (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 campo como new ) or ((( 5 oil complex trial ngo ) or ( 3.5 nacl gil carlos nava ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( j l campo como new ) OR ((( 5 oil complex trial ngo ) OR ( 3.5 nacl gil carlos nava )))).
• Adding a wildcard symbol may retrieve word variants: (( j l campo como new ) or ((( 5 oil complex trial ngo ) or ( 3.5 nacl gil carlos nava ))))*.