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