Perhaps you should try some spelling variations:
"complementarity contained problemassa" » "complementaridade contained problemassa" (Expand Search), "complementarity obtained problemassa" (Expand Search), "complementarity contained problemas" (Expand Search), "complementarity contained problematica" (Expand Search), "complementarity contained problemasssa" (Expand Search)
"complementar constraints problema" » "complementar constraints problemas" (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("complementarity contained problemassa") OR ("complementar constraints problema"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"complementarity contained problemassa\") OR (\"complementar constraints problema\"))".
• Removing quotes may allow a broader search: (( complementarity contained problemassa ) OR ( complementar constraints problema )).
• Adding a wildcard symbol may retrieve word variants: (("complementarity contained problemassa") OR ("complementar constraints problema"))*.