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