Perhaps you should try some spelling variations:
metil complex » metal complex (Expand Search), metals complex (Expand Search), met complex (Expand Search)
carlos nejar » carlos negrao (Expand Search), carlos nava (Expand Search), carlos neri (Expand Search)
complex tin » complex thin (Expand Search), complex ti (Expand Search), complex tif (Expand Search)
kcl carlos » akel carlos (Expand Search), gil carlos (Expand Search), del carlos (Expand Search)
comes con » comes can (Expand Search), comes down (Expand Search), comes joan (Expand Search)
tin ngoc » tien ngoc (Expand Search), tinh ngoc (Expand Search), ton ngoc (Expand Search)
7.5 nacl » 3.5 nacl (Expand Search), 0.9 nacl (Expand Search)
l comes » l comps (Expand Search), l coles (Expand Search), l comas (Expand Search)
con new » icon new (Expand Search), con nee (Expand Search), con net (Expand Search)
5 metil » 5 methyl (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 comes con new ) or ((( 5 metil complex tin ngoc ) or ( 7.5 nacl kcl carlos nejar ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( j l comes con new ) OR ((( 5 metil complex tin ngoc ) OR ( 7.5 nacl kcl carlos nejar )))).
• Adding a wildcard symbol may retrieve word variants: (( j l comes con new ) or ((( 5 metil complex tin ngoc ) or ( 7.5 nacl kcl carlos nejar ))))*.