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