Perhaps you should try some spelling variations:
method complex » methods complex (Expand Search), method coupled (Expand Search), method complexity (Expand Search)
complex tran » complex trans (Expand Search), complex tehran (Expand Search), complex trait (Expand Search)
carlos nova » carlos novoa (Expand Search), carlos nava (Expand Search), carlos noa (Expand Search)
kbr carlos » dr carlos (Expand Search), cyr carlos (Expand Search), aybar carlos (Expand Search)
comas con » compras con (Expand Search), formas con (Expand Search), poemas con (Expand Search)
5 method » 5 methods (Expand Search), 5 methoxy (Expand Search), 5 methyl (Expand Search)
tran ngo » tran ngoc (Expand Search), tran nho (Expand Search), tran nga (Expand Search)
0.9 nacl » 3.5 nacl (Expand Search)
nacl kbr » nacl nabr (Expand Search), nacl kcl (Expand Search), nacl kno (Expand Search)
m comas » m comps (Expand Search), m cobas (Expand Search)
con net » con nee (Expand Search), non net (Expand Search), upon net (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 m comas con net ) or ((( 5 method complex tran ngo ) or ( 0.9 nacl kbr carlos nova ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( j m comas con net ) OR ((( 5 method complex tran ngo ) OR ( 0.9 nacl kbr carlos nova )))).
• Adding a wildcard symbol may retrieve word variants: (( j m comas con net ) or ((( 5 method complex tran ngo ) or ( 0.9 nacl kbr carlos nova ))))*.