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Opera Opera Việt Nam Opera (trình duyệt web) Opera Software Operation Mincemeat (phim) Opera Nova Bydgoszcz Opera Mini Operação Prato Opera GX (trình duyệt web) Opera LeśnaTài liệu tham khảo
WikiPedia: Opera_Việt_Nam https://www.vnam.edu.vn/NewsDetail.aspx?lang=&Item... https://web.archive.org/web/20221003105919/https:/... https://www.worldcat.org/oclc/682149444 https://www.worldcat.org/title/682149444 https://www.google.com.vn/books/edition/Viet_Nam/m... https://www.vnam.edu.vn/NewsDetail.aspx?lang=&Item... https://books.google.com.vn/books/about/Acting.htm... https://www.vnam.edu.vn/rs/Document/2015-LeThiMinh... https://cand.com.vn/dien-dan-van-nghe-cong-an/oper... https://web.archive.org/web/20230103052724/https:/...