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 problemaaasa" » "complementar constraints problemaaaasa" (Expand Search), "complementar constraints problemasaaasa" (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 problemaaasa"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"complementaridade constrained problem\") OR (\"complementar constraints problemaaasa\"))".
• Removing quotes may allow a broader search: (( complementaridade constrained problem ) OR ( complementar constraints problemaaasa )).
• Adding a wildcard symbol may retrieve word variants: (("complementaridade constrained problem") OR ("complementar constraints problemaaasa"))*.