http://anidb.net/perl-bin/animedb.pl...ag=1#grouplist
To my knowledge, there is no "dubbed" encode of Happy Lesson TV. There are dual-audio encodes by Hentai-Legacy [HL], Anime-Takeover, and LIME-Anime that have Japanese audio, English audio, and English subtitles. If you're not able to switch to the Japanese audio on those releases, then there's a problem with your media player & codec setup.
http://anidb.net/perl-bin/animedb.pl?show=anime&aid=835
Otoh, Happy Lesson Advance never had an official English release, so there are no dubbed or dual-audio DVD-rips, only the Anime-Keep TV-fansubs.
http://anidb.net/perl-bin/animedb.pl?show=anime&aid=598
For the Happy Lesson OVA, the first three episodes were fansubbed, but to my knowledge those files are not available anywhere anymore. The first 3 episodes are available as dual-audio DVD-rips from LIME, anime-takeover, HL, and Real-Anime-Xtreme. Episodes 4 and 5 are not available in non-raw format at this point, but LIME will be releasing them as fansubs.