Ah, perfect timing for me to come across this thread! In three days (31 August 2012) would be the 15th day of the 7th lunar month - the day of practice as taught in the Ullambana Sutra.
According to a blogpost (http://blog.sina.com.cn/s/blog_608185ad0102dshw.html
) by this Buddhist whom I understand to be very knowledgeable in Buddhism, the text string "mi li dwo dwo pe ye" in Sanskrit should be "amṛtod-bhave".
You can find "amṛtod-bhave" in the mantra commonly known to Chinese Buddhists as 往生咒:
Namo amitābhāya tathāgatāya. Tadyathā, om, amṛtod-bhave, amṛta siddhaṃ bhave, amṛta vi-krānte, amṛta vi-krānta, gamini gagana, kīrti-kare svāhā.
Taisho Tripitaka Indian Compilation (T01-T32)
T12 Jewel Accumulation Lower Division
368. Eliminating All Fundamental Karmic Obstructions and Becoming Born in the Pureland Spiritual Mantra
You can also find "amṛtod-bhave" in the dharani 無量壽如來根本陀羅尼:
Namo ratna-trayāya. Nama ārya amitābhāya tathāgatāya arhate samyak-saṃbuddhāya. Tadyathā, om, amṛte, amṛtod-bhave, amṛta-saṃbhave, amṛta-garbhe, amṛta-siddhe, amṛta-teje, amṛta vi-krānte, amṛta vi-krānta gamini, amṛta gagana kīrti-kare, amṛta dundubhi-svare, sarva-artha sādhane, sarva karma-kleśa kṣayaṃ-kare svāhā.
Taisho Tripitaka Indian Compilation
T19 Esoteric Teachings Division II
930. The Liturgy for Offerings in the Limitless Life Thus Come One's Contemplation Practice