squere root of two over three

If you mean $\sqrt{\frac{2}{3}}:$

$\sqrt{\frac{2}{3}}$

$\frac{\sqrt{2}}{\sqrt{3}}$

$\frac{\sqrt{2}\sqrt{3}}{\sqrt{3}\sqrt{3}}$

$\frac{\sqrt{6}}3$

If you mean $\frac{\sqrt{2}}{3}:$

$\frac{\sqrt{2}}{3}$