Vajra Guru Mantra Banner. Translation: Aum Ah Hum Vajra Guru Padme Siddhi Hum
This is Guru Rinpoche's mantra (Padmasambhava) called the Vajra Guru Mantra a.k.a. The Golden Mantra. Try saying it 108 times, or once around a Tibetan Mala. Here's what Guru Rinpoche told Yeshe Tsogyal about this mantra. The explanation is a terma as well, since it was not discovered until the 14th century:
" ... If this mantra is recited a hundred times a day, merely a hundred times a day without interruption, one will become attractive to others and will effortlessly come by food and wealth and the necessities of life. If one recites it a thousand or ten thousand times on a daily basis, one is able to literally overwhelm others with one's brilliance, in the sense of becoming very charismatic and influential in exerting a positive influence over others, and one will gain unhindered force of blessings and spiritual power. ..."