Perhaps you should try some spelling variations:
complex tasks » complex task (Expand Search), complex tones (Expand Search), complex tears (Expand Search)
anal complex » analog complex (Expand Search), animal complex (Expand Search), faunal complex (Expand Search)
knopf carlos » prof carlos (Expand Search)
coley colin » colby colin (Expand Search), coles colin (Expand Search), cole colin (Expand Search)
carlos nava » carlos navarro (Expand Search), carlos eslava (Expand Search), carlos zavala (Expand Search)
nacl knopf » nacl kno (Expand Search)
tasks non » tasks nova (Expand Search), tasks can (Expand Search), tasks do (Expand Search)
l coley » l corley (Expand Search), l cole (Expand Search), b coley (Expand Search)
colin _ » colin a (Expand Search), colin d (Expand Search)
i anal » i anas (Expand Search), i analiz (Expand Search), i animal (Expand Search)
3 nacl » _ nacl (Expand Search), 3.5 nacl (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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( j l coley colin _ ) OR ((( i anal complex tasks non ) OR ( 3 nacl knopf carlos nava ))))~.
• Adding a wildcard symbol may retrieve word variants: (( j l coley colin _ ) or ((( i anal complex tasks non ) or ( 3 nacl knopf carlos nava ))))*.