There is no dua that will benefit you or will earn you a job without firm belief that Allah subhanahu wa taala is the only one who is the provider and only with His permission you and I breathe the air and consume provisons which He the Exalted created. Also remember, He grants your requests when He knows its best for you.
Etiquettes of dua include recognizing, praising, and thanking Allah SWT before asking. Best way of making dua is to follow a good deed with dua. Prayers are the best form of rememberance. Ignoring prayers and asking Allah for needs carry very little weight.
In The Name of Allah, O' Allah! Indeed I ask You the good of this market and the good therein and I seek refuge in You from the evil of this market and the evil therein and I seek refuge in You lest I take part in a harmful transaction/bargain
JK for duaz!
friends, dua is the fruit of worship. For dua it is important to firmly believe Allah is the only one who can listen to the call and respond. Ettiquetes of Dua also include doing it in purity, praising and thanking Allah before asking, humbling oneself by mentioning one's weakness and inabilities. Asking for halal things with humility and surity that Allah will answer the call.
got u 
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