If you are looking to search human translated, high quality Lojban-English bilingual sentences, try zmifanva's sister project jufsisku.
zmifanva is based on phrase-based statistical machine translation. If you are interested in contributing to zmifanva's development, view the source code on Github.
zmifanva does not always output correct translation or grammatical sentences, neither in English nor in Lojban.
If you find translation quality issues on zmifanva, please report from the link below.