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WikiPedia: Miễn_thuế http://www.mytaxbrackets.com/Tax-Exemptions.html http://www.law.cornell.edu/uscode/html/uscode26/us... http://www.irs.gov/charities/content/0,,id=96986,0... http://www.irs.gov/formspubs/article/0,,id=177992,... http://www.irs.gov/pub/irs-pdf/p557.pdf http://www.hmrc.gov.uk/incometax/personal-allow.ht... http://www.hmrc.gov.uk/index.htm http://www.hmrc.gov.uk/thelibrary/manuals-subjecta...