Perhaps you should try some spelling variations:
complex trex » complex tree (Expand Search), complex tetrex (Expand Search), complex tric (Expand Search)
carlos noble » carlos nobre (Expand Search), carlos robles (Expand Search), carlos dobles (Expand Search)
set complex » set1 complex (Expand Search), yet complex (Expand Search), onset complex (Expand Search)
kcl carlos » akel carlos (Expand Search), gil carlos (Expand Search), del carlos (Expand Search)
combs con » combs colin (Expand Search), combs john (Expand Search), combs cody (Expand Search)
trex ngoa » trieu ngoa (Expand Search)
con neue » con nee (Expand Search), von neuen (Expand Search), con neuro (Expand Search)
7.5 nacl » 3.5 nacl (Expand Search), 0.9 nacl (Expand Search)
e combs » sex combs (Expand Search)
5 set » 5 sets (Expand Search), a set (Expand Search), _ set (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 con neue ) or ((( 5 set complex trex ngoa ) or ( 7.5 nacl kcl carlos noble ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( j e combs con neue ) OR ((( 5 set complex trex ngoa ) OR ( 7.5 nacl kcl carlos noble )))).
• Adding a wildcard symbol may retrieve word variants: (( j e combs con neue ) or ((( 5 set complex trex ngoa ) or ( 7.5 nacl kcl carlos noble ))))*.