Perhaps you should try some spelling variations:
complex trang » complex trans (Expand Search), complex trait (Expand Search), complex trace (Expand Search)
nano carlos » cano carlos (Expand Search), nino carlos (Expand Search), nuno carlos (Expand Search)
hobbs john » hobbs jean (Expand Search)
yl complex » gl complex (Expand Search), cl complex (Expand Search), fl complex (Expand Search)
trang ngoc » tran ngoc (Expand Search), trung ngoc (Expand Search), rang ngoc (Expand Search)
carlos noa » carlos noe (Expand Search), carlos nodal (Expand Search), carlos nava (Expand Search)
nacl nano » nacl kno (Expand Search), nacl nabr (Expand Search), nacl naoh (Expand Search)
john nee » john new (Expand Search), john neena (Expand Search), john neetu (Expand Search)
0.9 nacl » 3.5 nacl (Expand Search)
5 yl » 2 yl (Expand Search), 1 yl (Expand Search), 4 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 j hobbs john nee ) or ((( 5 yl complex trang ngoc ) or ( 0.9 nacl nano carlos noa ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( j j hobbs john nee ) OR ((( 5 yl complex trang ngoc ) OR ( 0.9 nacl nano carlos noa )))).
• Adding a wildcard symbol may retrieve word variants: (( j j hobbs john nee ) or ((( 5 yl complex trang ngoc ) or ( 0.9 nacl nano carlos noa ))))*.