Perhaps you should try some spelling variations:
complex tears » complex than (Expand Search), complex tones (Expand Search), complex task (Expand Search)
combs colic » combs colin (Expand Search), combe colin (Expand Search)
carlos note » carlos noe (Expand Search), carlos nobre (Expand Search), carlos nojek (Expand Search)
mt complex » most complex (Expand Search), cst complex (Expand Search), ift complex (Expand Search)
colic new » coli new (Expand Search)
un carlos » tun carlos (Expand Search), gun carlos (Expand Search), aun carlos (Expand Search)
7.5 nacl » 3.5 nacl (Expand Search), 0.9 nacl (Expand Search)
e combs » sex combs (Expand Search)
nacl un » nacl en (Expand Search), nacl upon (Expand Search), nacl kno (Expand Search)
5 mt » 5 ht (Expand Search), _ mt (Expand Search), 5 mg (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 e combs colic new ) OR ((( 5 mt complex tears _ ) OR ( 7.5 nacl un carlos note ))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( j e combs colic new ) OR ((( 5 mt complex tears _ ) OR ( 7.5 nacl un carlos note ))))".
• Adding a wildcard symbol may retrieve word variants: (( j e combs colic new ) OR ((( 5 mt complex tears _ ) OR ( 7.5 nacl un carlos note ))))*.