Thanks for your response,
As I am fairly new to domaining, I'm not really sure how to go about putting the effort in to sell the domains to a wider client base, I know I should email some companies that may be interested, but other than that I'm not too sure what else I can do to gain more traction and interest in these domains.
If you have not already, the first step should be to list them somewhere on a Marketplace like Undeveloped, the Afternic Network, Sedo, etc., or if hoping to sell "wholesale" to domainers a place like NamePros.
You should set it up so that a lander page will appear with information contact and perhaps price or other information when someone enters the domain name, although the odds of that is low with a multiple word one probably.
You may have options in social media to promote that you have the names, with hashtags that might attract clients. If you do this be discrete as people don't like to be spammed.
One option is to set up your own website so people looking for domains involving the keywords will find you, although this takes a lot of time to get high in search, although ultimately this is probably best.
I live in a country that limits outbound "cold" emails to most, but if you are allowed, you can research possible clients for your domain names.
Keep in mind even if you do all of these things, the odds of any one domain name selling in a year are low (certainly less than 1 chance in 100)
I am not sure where you have them registered. If there is an associated Marketplace, e.g. NameSilo, Namecheap, etc. one easy option is to list them there. I find this does work but only if you are willing to sell them at really bargain basement prices.
Good luck