Perhaps you should try some spelling variations:
method complex » methods complex (Expand Search), method coupled (Expand Search), method complexity (Expand Search)
complex trs » complex tris (Expand Search), complex tears (Expand Search), complex trans (Expand Search)
nabr carlos » jair carlos (Expand Search), aybar carlos (Expand Search), bauer carlos (Expand Search)
carlos nara » carlos lara (Expand Search), carlos nava (Expand Search), carlos jara (Expand Search)
combs con » combs colin (Expand Search), combs john (Expand Search), combs cody (Expand Search)
nucl nabr » nacl nabr (Expand Search)
5 method » 5 methods (Expand Search), 5 methoxy (Expand Search), 5 methyl (Expand Search)
trs ngoc » tra ngoc (Expand Search), tran ngoc (Expand Search), tram ngoc (Expand Search)
l combs » e combs (Expand Search), _ combs (Expand Search), l comps (Expand Search)
con nee » con net (Expand Search), con noe (Expand Search), con node (Expand Search)
3 nucl » 3 null (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 combs con nee ) or ((( 5 method complex trs ngoc ) or ( 3 nucl nabr carlos nara ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( j l combs con nee ) OR ((( 5 method complex trs ngoc ) OR ( 3 nucl nabr carlos nara )))).
• Adding a wildcard symbol may retrieve word variants: (( j l combs con nee ) or ((( 5 method complex trs ngoc ) or ( 3 nucl nabr carlos nara ))))*.