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as long as it is for something that did not happen yet, you can pray for it. so for example if one hears about some disaster that killed people, he should not pray saying "let it not be such and such a person that was killed" for that already happened (Mishna Berachot, see there for examples of what to pray for).

Other than that, "Open your mouth wide and I will fill it" (Tehilim 81:10), the more the better.

Rabbi Yehonotan Eibshutz composed a work on intent in the Shemonei Esrei. there he writes (on shema koleinu section): "In it one should put all his aspirations to G-d, to pray for all his needs even for a small thing or (all the more so) a large one do not perform anything that you didn't pray for to G-d first.."

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