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WikiPedia: Hạnh_phúc http://www.britannica.com/EBchecked/topic/254741 http://www.wolframalpha.com/input/?i=happiness&a=*... http://catalogue.bnf.fr/ark:/12148/cb11935779w http://data.bnf.fr/ark:/12148/cb11935779w http://id.loc.gov/authorities/subjects/sh85058807 http://d-nb.info/gnd/4021325-0 http://id.ndl.go.jp/auth/ndlna/00566227 http://bachkhoatoanthu.vass.gov.vn/noidung/tudien/...