In this research, we have investigated tachyon and k-essence dark energy (DE) candidates with varying G and Lambda for Marder universe in f(R, T) gravitation theory [Harko et al., Phys. Rev. D 84, 024020 (2011)]. Here, f(R, T) is the arbitrary function of Ricci scalar (R) and the trace of T-ik. To solve f(R, T) gravity field equations, three different approximations have been used such as cosmological term, equation of state (EoS) parameter and the anisotropy feature of Marder universe. Also, we have discussed some physical results with various graphics.