Perhaps you should try some spelling variations:
"complementaridade constrained problema" » "complementaridade contained problema" (Expand Search), "complementaridade constrained problemas" (Expand Search)
"complementar constraints problemass" » "complementar constraints problemasss" (Expand Search), "complementar constraints problemas" (Expand Search), "complementar constraints problems" (Expand Search), "complementar constraints problemes" (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: (("complementaridade constrained problema") OR ("complementar constraints problemass"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"complementaridade constrained problema\") OR (\"complementar constraints problemass\"))*".
• Removing quotes may allow a broader search: (( complementaridade constrained problema ) OR ( complementar constraints problemass ))*.