Perhaps you should try some spelling variations:
complex trex » complex tree (Expand Search), complex tetrex (Expand Search), complex tric (Expand Search)
mec complex » sec complex (Expand Search), c complex (Expand Search), bc complex (Expand Search)
cano carlos » luciano carlos (Expand Search), bacino carlos (Expand Search), solano carlos (Expand Search)
carlos noe » carlos nobre (Expand Search), carlos nojek (Expand Search), carlos n (Expand Search)
trex ngoa » trieu ngoa (Expand Search)
nacl cano » nacl nano (Expand Search), nacl caso4 (Expand Search), nacl cacl (Expand Search)
7.2 nacl » 7.5 nacl (Expand Search), 3.5 nacl (Expand Search), 0.9 nacl (Expand Search)
l camps » l campos (Expand Search), _ camps (Expand Search), e camps (Expand Search)
camps i » camps _ (Expand Search), camps f (Expand Search), camps m (Expand Search)
i net » i neto (Expand Search), _ net (Expand Search), u net (Expand Search)
5 mec » _ mec (Expand Search), 5 meo (Expand Search), 5 mev (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 camps i net ) or ((( 5 mec complex trex ngoa ) or ( 7.2 nacl cano carlos noe ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( j l camps i net ) OR ((( 5 mec complex trex ngoa ) OR ( 7.2 nacl cano carlos noe )))).
• Adding a wildcard symbol may retrieve word variants: (( j l camps i net ) or ((( 5 mec complex trex ngoa ) or ( 7.2 nacl cano carlos noe ))))*.