" Var " and " Yok" can be used as a head of an adjective phrase. There are few fixed phrases like that ; 

Var gücüyle ---> With all [existing] power of oneself.

Var gücüyle arabayı itmeye başladı.  ---> He started to push the car with all his power.

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Yok  yere  ---> for no apparent reason, for no reason, without reason

Yok yere kendini üzme ---> Don´t be upset for no reason. [without reason]

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Yok pahasına ----> Very cheap, for a song [phrasal], to give something away

Arabasını yok pahasına sattı. ---> He/She sold his/her car for a very little money.

                                                He/She sold  his/her car for a song. 

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