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 problemastica" » "complementar constraints problemasstica" (Expand Search), "complementar constraints problematica" (Expand Search), "complementar constraints problematic" (Expand Search), "complementar constraints problematicas" (Expand Search)

Try widening your search to All Fields.

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