Perhaps you should try some spelling variations:
complex tien » complex times (Expand Search), complex than (Expand Search), complex time (Expand Search)
carlos rojek » carlos nojek (Expand Search), carlos rojas (Expand Search), carlos roger (Expand Search)
mol complex » iol complex (Expand Search), mol complexes (Expand Search), coil complex (Expand Search)
caso carlos » castro carlos (Expand Search), ascaso carlos (Expand Search), casado carlos (Expand Search)
combs coli » combs colin (Expand Search), combe colin (Expand Search), combs cody (Expand Search)
nac caso » pac caso (Expand Search), nacl caso4 (Expand Search), fnac case (Expand Search)
e combs » sex combs (Expand Search)
tien ng » tien ngo (Expand Search), tien n (Expand Search), tien ni (Expand Search)
3.5 nac » 3.5 nacl (Expand Search), 7.5 nacl (Expand Search)
5 mol » j mol (Expand Search), 1 mol (Expand Search), _ mol (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 e combs coli new ) OR ((( 5 mol complex tien ng ) OR ( 3.5 nac caso carlos rojek ))))~.
• Adding a wildcard symbol may retrieve word variants: (( j e combs coli new ) or ((( 5 mol complex tien ng ) or ( 3.5 nac caso carlos rojek ))))*.