That's weird for Damaged Good. After the cutscene where Trevor's mother make is demand, Trevor return outside of his safehouse... after that you only need to find a Deludamol van (and a waypoint back to the safehouse will appear... where you need to go to complete the mission).
Go there for requirements needed and some explanation: http://m.ign.com/wikis/gta-5/Damaged_Goods
The only requirements are to finish the storyline AND kept Trevor alive. Once the storyline is completed, the mission S&F "Mrs Philips" appear and after talking to her, you only need to find the van.
For "Uncalculated risk", this mission seems a little buggy. After finishing "Targeted risk" (where you have to parachute jump a bulding with Dom and land on a moving truck), you have do all 13 parachutes jumps on the map.
After that it's where it get complicated... no one seems to know exactly when the last Dom's mission "Uncalculated Risk" appear. Just roam around finish anything else you have to do. For me, what's work was to go on GTAO and do some missions beside finishing grabbing collectibles in Story Mode. After a few (not to say a lot) in-game days... the D? finally appear. Just be patient is the key I think.