Perhaps you should try some spelling variations:
"complementaridade contained problema" » "complementaridade obtained problema" (Expand Search), "complementaridade contained problemas" (Expand Search)
"complementar constraints problemaatica" » "complementar constraints problemasatica" (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: (("complementaridade contained problema") OR ("complementar constraints problemaatica"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"complementaridade contained problema\") OR (\"complementar constraints problemaatica\"))".
• Removing quotes may allow a broader search: (( complementaridade contained problema ) OR ( complementar constraints problemaatica )).
• Adding a wildcard symbol may retrieve word variants: (("complementaridade contained problema") OR ("complementar constraints problemaatica"))*.