Perhaps you should try some spelling variations:
metil complex » metal complex (Expand Search), metals complex (Expand Search), met complex (Expand Search)
complex trex » complex tree (Expand Search), complex tetrex (Expand Search), complex tric (Expand Search)
nino carlos » cano carlos (Expand Search), bacino carlos (Expand Search), semino carlos (Expand Search)
carlos nada » carlos nadaf (Expand Search), carlos nava (Expand Search), carlos nara (Expand Search)
campo con » campo como (Expand Search), campo c (Expand Search)
trex ngoa » trieu ngoa (Expand Search)
natl nino » al nino (Expand Search), raul nino (Expand Search), natalia nino (Expand Search)
al campo » el campo (Expand Search), del campo (Expand Search), al cambio (Expand Search)
7.5 natl » 7.5 nacl (Expand Search), 3.5 nacl (Expand Search)
con nee » con net (Expand Search), con noe (Expand Search), con node (Expand Search)
5 metil » 5 methyl (Expand Search)
j al » j a (Expand Search), j l (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.

• Removing quotes may allow a broader search: (( j al campo con nee ) or ((( 5 metil complex trex ngoa ) or ( 7.5 natl nino carlos nada ))))~.