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