Instituto para la
Investigación Educativa
y el Desarrollo Pedagógico

Perhaps you should try some spelling variations:
"head of state" » "head or state", "head of hate", "had of state", "mead of state", "read of state"
"heads of state" » "heads or state", "heads of hate", "means of state", "years of state", "hads of state", "meads of state", "reads of state"
"heads of shame" » "means of shame", "years of shame", "heads of hate", "hads of shame", "meads of shame", "reads of shame"
"heads of late" » "means of late", "years of late", "heads of hate", "heads of latin", "hads of late", "meads of late", "reads of late"

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: "((\"head of state\") OR (((((\"heads of state\") OR (\"heads of shame\"))) OR (\"heads of late\"))))~".
• Removing quotes may allow a broader search: (( head of state ) OR ((((( heads of state ) OR ( heads of shame ))) OR ( heads of late ))))~.
• Adding a wildcard symbol may retrieve word variants: (("head of state") OR ((((("heads of state") OR ("heads of shame"))) OR ("heads of late"))))*.