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