Quasi-isotropic orbital magnetoresistance in lightly doped <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>SrTiO</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math>

A magnetic field parallel to an electrical current does not produce a Lorentz force on the charge carriers. Therefore, orbital longitudinal magnetoresistance is unexpected. Here we report observation of large and non saturating in lightly doped SrTiO$_{3-x}$ independent relative orientation field. We show that this quasi-isotropic can be explained if carrier mobility along all orientations smoothly decreases with This anomalous regime restricted low concentrations when dipolar correlation length longer than distance between identify cyclotron motion electrons potential landscape tailored by polar domains as cradle magnetoresistance. The result emerges challenge theory may generic feature lightly-doped quantum paralectric materials.