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