Perhaps you should try some spelling variations:
"complementarity constrained problemas" » "complementar constrained problemas" (Expand Search), "complementarity contained problemas" (Expand Search)
"complementaridade constraints problematicas" » "complementaridade constraints problematica" (Expand Search), "complementaridade constraints problematic" (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: "((\"complementarity constrained problemas\") OR (\"complementaridade constraints problematicas\"))~".
• Removing quotes may allow a broader search: (( complementarity constrained problemas ) OR ( complementaridade constraints problematicas ))~.
• Adding a wildcard symbol may retrieve word variants: (("complementarity constrained problemas") OR ("complementaridade constraints problematicas"))*.