Perhaps you should try some spelling variations:
la complicada » la complicidad (Expand Search), _ complicada (Expand Search), e complicada (Expand Search)
complicada en » aplicada en (Expand Search), comparada en (Expand Search)
complejo caso » complejas caso (Expand Search), complejo como (Expand Search), complejo camino (Expand Search)
carlos newton » carlos nelson (Expand Search), carlos nieto (Expand Search), santos newton (Expand Search)
yl complejo » el complejo (Expand Search), al complejo (Expand Search), y complejo (Expand Search)
joly carlos » herly carlos (Expand Search)
caso ngo » caso nao (Expand Search), cso ngo (Expand Search), caso agro (Expand Search)
en nee » yen nee (Expand Search), wen nee (Expand Search), fen nee (Expand Search)
j la » j a (Expand Search), j l (Expand Search), j da (Expand Search)
4 yl » 2 yl (Expand Search), 1 yl (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 la complicada en nee ) or ((( 4 yl complejo caso ngo ) or ( 3 a joly carlos newton ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( j la complicada en nee ) OR ((( 4 yl complejo caso ngo ) OR ( 3 a joly carlos newton )))).
• Adding a wildcard symbol may retrieve word variants: (( j la complicada en nee ) or ((( 4 yl complejo caso ngo ) or ( 3 a joly carlos newton ))))*.