One reason for this might be that Turkish people prefer to give informally. According to the report mentioned above, 87% of Turkish people in 2004 said that they prefer to give directly to beneficiaries. If this is due to a lack of profile for CSOs then this can be addressed through more professionalism in communications by organizations. If it is due to a lack of trust in organizations this can be addressed through independent, public facing and transparent regulation. Actually, I have written an entire report on this.
Why aren’t Turkish people giving regularly to civil society organisations? | Future World Giving