Photometric observations and orbital period variations of HS 0705Â +Â 6700 and NY Vir

► We present photometric observations of two post-common-envelope stars. ► The new light curves were analyzed and the physical parameters of stars were determined. ► We find evidence about the existence of a third star bounded to the system HS 0705. ► The O-C residuals obtained for NY Vir indicate orbital period decrease in the system.