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)
"complementar constraints problemasaass" » "complementar constraints problemaasaass" (Expand Search), "complementar constraints problemasasaass" (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 (\"complementar constraints problemasaass\"))~".
• Removing quotes may allow a broader search: (( complementaridade constrained problem ) OR ( complementar constraints problemasaass ))~.
• Adding a wildcard symbol may retrieve word variants: (("complementaridade constrained problem") OR ("complementar constraints problemasaass"))*.