What exercises are good for bow-legged?

This is a vague question. Why are they bow-legged? Do they have pain with any activities? In what way is their pelvis unlevel? Do they have leg length discrepancies?

I’d suggest that you take a look on Google Scholar or Pubmed for exercise and genu varum. You will find some useful information. Beyond that, I would get a thorough health history. Without this, it is impossible for anyone to give you advice.