Perhaps you should try some spelling variations:
complex trieu » complex trial (Expand Search), complex tree (Expand Search), complex tric (Expand Search)
marlos nobre » carlos nobre (Expand Search), marcos nobre (Expand Search), maria nobre (Expand Search)
set complex » set1 complex (Expand Search), yet complex (Expand Search), onset complex (Expand Search)
trieu ngoc » tieu ngoc (Expand Search), trieu ngoa (Expand Search), trinh ngoc (Expand Search)
combs con » combs colin (Expand Search), combs john (Expand Search), combs cody (Expand Search)
con note » con notas (Expand Search)
l combs » e combs (Expand Search), _ combs (Expand Search), l comps (Expand Search)
5 set » 5 sets (Expand Search), a set (Expand Search), _ set (Expand Search)
nacl » natl (Expand Search), nac (Expand Search), nucl (Expand Search)
kcl » kcal (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 note ) or ((( 5 set complex trieu ngoc ) or ( 3.5 nacl kcl marlos nobre ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( j l combs con note ) OR ((( 5 set complex trieu ngoc ) OR ( 3.5 nacl kcl marlos nobre )))).
• Adding a wildcard symbol may retrieve word variants: (( j l combs con note ) or ((( 5 set complex trieu ngoc ) or ( 3.5 nacl kcl marlos nobre ))))*.