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