Perhaps you should try some spelling variations:
"complementaridade constrained problematica" » "complementaridade contained problematica" (Expand Search), "complementaridade constrained problemastica" (Expand Search)
"complementarity constraints problema" » "complementar constraints problema" (Expand Search), "complementarity constraints problemas" (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"complementaridade constrained problematica\") OR (\"complementarity constraints problema\"))~".
• Removing quotes may allow a broader search: (( complementaridade constrained problematica ) OR ( complementarity constraints problema ))~.
• Adding a wildcard symbol may retrieve word variants: (("complementaridade constrained problematica") OR ("complementarity constraints problema"))*.