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