Perhaps you should try some spelling variations:
metal complex » metal complexes (Expand Search)
complex tien » complex times (Expand Search), complex than (Expand Search), complex time (Expand Search)
kuhl carlos » gual carlos (Expand Search), riehl carlos (Expand Search), diehl carlos (Expand Search)
carlos nota » carlos mota (Expand Search), carlos noa (Expand Search), carlos noda (Expand Search)
comps con » compost con (Expand Search), comps los (Expand Search)
tien ngoc » tran ngoc (Expand Search), diep ngoc (Expand Search), tuan ngoc (Expand Search)
nac kuhl » a kuhl (Expand Search), c kuhl (Expand Search)
l comps » m comps (Expand Search)
con new » icon new (Expand Search), con nee (Expand Search), con net (Expand Search)
5 metal » 5 methyl (Expand Search)
0.9 nac » 0.9 nacl (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 comps con new ) or ((( 5 metal complex tien ngoc ) or ( 0.9 nac kuhl carlos nota ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( j l comps con new ) OR ((( 5 metal complex tien ngoc ) OR ( 0.9 nac kuhl carlos nota )))).
• Adding a wildcard symbol may retrieve word variants: (( j l comps con new ) or ((( 5 metal complex tien ngoc ) or ( 0.9 nac kuhl carlos nota ))))*.