This is misleading -- It likely means there were not enough cells to make a definite diagnosis and that repeat FNA is indicated. "non-diagnostic" in some reports means "indeterminate" (a better description) and that surgery may be the only way to make a diagnosis. But most likely it means not enough cells were present to make a diagnosis.
The hypoechoic comment and increased vascularity are features of suspicion on ultrasound -- please follow-up with a thyroid specialist to make sure you get the right diagnosis and plan.
Error to the sign of caution and get another biopsy or second opinion.
I might be wrong, but I think that all in all, it is not a good collection of cells and can't really tell if it is suspicious for cancer or not...might have to do another FNA - I am not a doctor - just thought I'd throw that out there. Good Luck!