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