Perhaps you should try some spelling variations:
methyl complex » metal complex (Expand Search), method complex (Expand Search), methylase complex (Expand Search)
complex trieu » complex trial (Expand Search), complex tree (Expand Search), complex tric (Expand Search)
trieu ngoa » trieu ngoc (Expand Search), thieu nga (Expand Search), trieu nghi (Expand Search)
carlos naa » carlos nava (Expand Search), carlos nara (Expand Search), carlos noa (Expand Search)
combs con » combs colin (Expand Search), combs john (Expand Search), combs cody (Expand Search)
7.2 nacl » 7.5 nacl (Expand Search), 3.5 nacl (Expand Search), 0.9 nacl (Expand Search)
l carlos » gil carlos (Expand Search)
l combs » e combs (Expand Search), _ combs (Expand Search), l comps (Expand Search)
con net » con nee (Expand Search), non net (Expand Search), upon net (Expand Search)
nacl l » nacl _ (Expand Search), nacl a (Expand Search), nacl e (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 con net ) or ((( 5 methyl complex trieu ngoa ) or ( 7.2 nacl l carlos naa ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( j l combs con net ) OR ((( 5 methyl complex trieu ngoa ) OR ( 7.2 nacl l carlos naa )))).
• Adding a wildcard symbol may retrieve word variants: (( j l combs con net ) or ((( 5 methyl complex trieu ngoa ) or ( 7.2 nacl l carlos naa ))))*.