Give me the name of the organization hqed at  Chaeng Watthana Govt Complex?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/headquarter> <http://dbpedia.org/resource/Chaeng_Watthana_Government_Complex> . ?x <http://dbpedia.org/property/agencyName> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Organisation>}
Chaeng_Watthana_Government_Complex