Perhaps you should try some spelling variations:
"multiobjective optimization problema" » "objective optimization problema" (Expand Search), "objective optimisation problema" (Expand Search), "multiobjective optimization problems" (Expand Search)
"multiobjective optimisation problems" » "objective optimisation problems" (Expand Search), "objective optimization problems" (Expand Search), "multiobjective optimization problems" (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"multiobjective optimization problema\") OR (\"multiobjective optimisation problems\"))~".
• Removing quotes may allow a broader search: (( multiobjective optimization problema ) OR ( multiobjective optimisation problems ))~.
• Adding a wildcard symbol may retrieve word variants: (("multiobjective optimization problema") OR ("multiobjective optimisation problems"))*.