How to change sorting from ascending/descending to sort by name only

[VMRESLO]

Hello everyone!

I am desperately looking for a way to change from the default sorting from ascending/descending to sort by name only. I am would like to have sorting options like "lower price up", "newest products" and "products from A-Z", without the option to reverse sorting on the frontend.

Please help, any help would be greatly appreciated.

I am using VirtueMart 3.0.6.2, Joomla 3.4.1, php 5.5, site link: http://drazba-drazbe.com/

Thank you and best regards to all!