Here are a few options:
Informal:
* ཁྱེད་རང་གསལ་བ་ཡིན་ནམ། (khye rang salwa yin nam?) - This literally translates to "Are you well?" and is the most common informal greeting.
Formal:
* ཁྱེད་རང་ཇི་འདྲ་ཡིན་ནམ། (khye rang ji dra yin nam?) - This translates to "How are you?" and is used when addressing someone of higher status or in a formal setting.
More polite:
* ཁྱེད་རང་གསལ་བ་ཡིན་ནམ། བདེ་མོ་ཡིན་ནམ། (khye rang salwa yin nam? de mo yin nam?) - This adds "Are you happy?" to the informal greeting, making it more polite.
Note:
* Tibetan is written right to left, so the phrase should be read from the right side of the page to the left.
* The pronunciation might vary slightly depending on the region and dialect.
You can use any of these phrases to ask someone how they are in Tibetan.