India has achieved remarkable successes in unmanned space missions including the Chandrayaan and Mars Orbitter Mission, but has not ventured into manned space mission, both in terms of technology and logistics? Explain critically

Technology obstacles:
1. India has entered late into GS:LV regime, that can lift off the heavy satellites (it enetered late into MTCR), so with PSLV technologies were unable for a manned space mission (need a tehcnology that can lift off heavier versions).; also manned space mission currently technology available with Russia, China and US. (GSLV need much more tweaking to achiev manned space mission, technology transfer has not tken place from these countries)
Logistics obstacles:
1. space base mainly publicly owned ; ISRO and Space centre located at Bengaluru, need also private owners for assembly and contributing the required manpower.
However despite this, governemnt is passionate about chandrayaan mission, first moon landing mission in 2018 (with ISRO and private partners and tweaking of GSLV)

*It is not a manned mission, but a rover and lander
**you are right in tweaking technologies- we need a life supporting system, technology that can dock into the space station, environmental control and life supporting system, re-entry technology and etc.