Where can I find airspace maps for Turkey?
What you need would be named "ICAO 1/500,000 map", this is a VFR map with airspace class, based on a Lambert conformal conic projection. Example in the US (1/250,000):

  

The best I can find online is SkyVector, but you said it's not sufficient for you needs:

  

By searching carefully you may find things like that:



(source: University of Texas)

But these are 1/1,000,000th very old maps from US DoD.

An alternative would be to use the online GIS viewer from ICAO, selecting carefully layers and data to display, my trial at that:



It must be improved to suit your needs, but I don't expect it to be better than SkyVector. By clicking on a location, you can display all the information about relevant areas (description, limits, etc).



For enroute, Eurocontrol provide two maps:


High altitude
Low altitude.


Good for intersection points and routes.



On the airport plates side, the AIP for Turkey is not in public access, but several sites provide plates, e.g.:


Turkish Virtual Airlines (static)
RocketRoute (interactive)


AirportNavFinder provides link to other sites like SkyVector.

IVAO Turkey could be a good point of contact to discuss local documentation. They have a section Charts accessible to registered users.  - VACC turkey is another virtual network.

If you can provide additional requirements, me or someone else may provide better material.