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