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