Perhaps you should try some spelling variations:
complex trieu » complex trial (Expand Search), complex tree (Expand Search), complex tric (Expand Search)
met complex » yet complex (Expand Search), set complex (Expand Search), metal complex (Expand Search)
carlos nova » carlos novoa (Expand Search), carlos nava (Expand Search), carlos noa (Expand Search)
kcl carlos » akel carlos (Expand Search), gil carlos (Expand Search), del carlos (Expand Search)
combs non » combs john (Expand Search), combat non (Expand Search), combs jan (Expand Search)
trieu ngo » trieu ngoa (Expand Search), trieu ngoc (Expand Search), tieu ngo (Expand Search)
7.2 nacl » 7.5 nacl (Expand Search), 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)
5 met » 5 meo (Expand Search), 5 mev (Expand Search), 5 mec (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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( j l combs non net ) OR ((( 5 met complex trieu ngo ) OR ( 7.2 nacl kcl carlos nova ))))~.
• Adding a wildcard symbol may retrieve word variants: (( j l combs non net ) or ((( 5 met complex trieu ngo ) or ( 7.2 nacl kcl carlos nova ))))*.