Perhaps you should try some spelling variations:
complex tran » complex trans (Expand Search), complex tehran (Expand Search), complex trait (Expand Search)
caso4 carlos » caso carlos (Expand Search), caro carlos (Expand Search), casal carlos (Expand Search)
carlos nodal » carlos vidal (Expand Search), carlos nava (Expand Search), carlos nejar (Expand Search)
yl complex » gl complex (Expand Search), cl complex (Expand Search), fl complex (Expand Search)
nacl caso4 » nacl na2so4 (Expand Search)
l coombs » l coombes (Expand Search), _ coombs (Expand Search), g coombs (Expand Search)
john new » john agnew (Expand Search), john neil (Expand Search), john noel (Expand Search)
tran ngo » tran ngoc (Expand Search), tran nho (Expand Search), tran nga (Expand Search)
7.5 nacl » 3.5 nacl (Expand Search), 0.9 nacl (Expand Search)
1 yl » 2 yl (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 coombs john new ) or ((( 1 yl complex tran ngo ) or ( 7.5 nacl caso4 carlos nodal ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( j l coombs john new ) OR ((( 1 yl complex tran ngo ) OR ( 7.5 nacl caso4 carlos nodal )))).
• Adding a wildcard symbol may retrieve word variants: (( j l coombs john new ) or ((( 1 yl complex tran ngo ) or ( 7.5 nacl caso4 carlos nodal ))))*.