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