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