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Hadronic transitions of $\chi_{cJ}\to \eta_{c}\pi^{+}\pi^{-}$ (J=0, 1, 2) aresearched for using a sample of $1.06\times 10^{8}$ $\psi(3686)$ eventscollected with the BESIII detector at the BEPCII storage ring. The $\etac$ isreconstructed with $K_{S}^{0}K^{+}\pi^{-}+c.c.$ and $K^{+}K^{-}\pi^{0}$ finalstates. No signals are observed in any of the three $\chi_{cJ}$ states ineither $\etac$ decay mode. At the 90% confidence level, the upper limits aredetermined to be $\BR(\chi_{c0}\to \eta_{c}\pi^{+}\pi^{-})<0.07%$,$\BR(\chi_{c1}\to \eta_{c}\pi^{+}\pi^{-})<0.32%$, and $\BR(\chi_{c2}\to\eta_{c}\pi^{+}\pi^{-})<0.54%$. The upper limit of $\BR(\chi_{c1}\to\eta_{c}\pi^{+}\pi^{-}$ is lower than the existing theoretical prediction byalmost an order of magnitude. The branching fractions of $\chi_{cJ}\toK_{S}^{0}K^{+}\pi^{-}\pi^{+}\pi^{-}+c.c.$, $K^{+}K^{-}\pi^{+}\pi^{-}\pi^{0}$,$\omega K^{+}K^{-}$ and $\phi\pi^{+}\pi^{-}\pi^{0}$ (J=0, 1, 2) are measuredfor the first time.

Search for hadronic transition $\chi_{cJ}\to\eta_{c}\pi^{+}\pi^{-}$ and observation of $\chi_{cJ}\to K\bar{K}\pi\pi\pi$