Instituto para la
Investigación Educativa
y el Desarrollo Pedagógico

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

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("head of state") OR ("head or state"))) OR ((("heads of state") OR ("reads of shape"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"head of state\") OR (\"head or state\"))) OR (((\"heads of state\") OR (\"reads of shape\"))))".
• Removing quotes may allow a broader search: (((( head of state ) OR ( head or state ))) OR ((( heads of state ) OR ( reads of shape )))).
• Adding a wildcard symbol may retrieve word variants: (((("head of state") OR ("head or state"))) OR ((("heads of state") OR ("reads of shape"))))*.