Perhaps you should try some spelling variations:
complex tuyen » complex tube (Expand Search), complex tuber (Expand Search), complex tunes (Expand Search)
set complex » set1 complex (Expand Search), yet complex (Expand Search), onset complex (Expand Search)
caso carlos » castro carlos (Expand Search), ascaso carlos (Expand Search), casado carlos (Expand Search)
carlos nota » carlos mota (Expand Search), carlos noa (Expand Search), carlos noda (Expand Search)
tuyen ngoc » nguyen ngoc (Expand Search), tuan ngoc (Expand Search), yen ngoc (Expand Search)
combs non » combs john (Expand Search), combat non (Expand Search), combs jan (Expand Search)
nacl caso » nacl caso4 (Expand Search), nacl cacl (Expand Search), nacl co (Expand Search)
7.5 nacl » 3.5 nacl (Expand Search), 0.9 nacl (Expand Search)
l combs » e combs (Expand Search), _ combs (Expand Search), l comps (Expand Search)
non net » non nest (Expand Search), con net (Expand Search), non nef (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 non net ) or ((( a set complex tuyen ngoc ) or ( 7.5 nacl caso carlos nota ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( j l combs non net ) OR ((( a set complex tuyen ngoc ) OR ( 7.5 nacl caso carlos nota )))).
• Adding a wildcard symbol may retrieve word variants: (( j l combs non net ) or ((( a set complex tuyen ngoc ) or ( 7.5 nacl caso carlos nota ))))*.