If you want to be sure you aren't missing anything you might need, why not go to onelook.com and enter * therapy as your search term (there should be a space between * and therapy)? That will pull up 6 pages of all the phrases ending with therapy in any of their referenced dictionaries, which include Stedmans and Dorlands, plus those found through Google. Then skim through pulling out the ones you want to make shorts for.
You might try another trick to decrease your typing time for those entries. Select and copy all the text with therapy phrases on the first page of your results, and paste into a Word document using Edit>Paste Special, Unformatted Unicode text. Copy the next page and add it to the list, etc. When done, go to Tables>Convert>Text to Table and enter . as your delimiter character to get a two column table. Click above the first column with the numbers to highlight the whole column, go to Table>Split Cells, and select two columns. All your numbers will move into the first, now giant, cell. Select that cell and delete contents. Type an = sign into the first cell of the middle column, select and copy it. Then highlight the whole middle column by clicking above it to select, and then paste. You will now have an = sign in every middle cell. You're ready to go. Start down-arrowing/tabbing through the table, adding shorts in the first column for entries you want to keep, and deleting the phrase for those you don't. When you are done, select the whole table, go back to Tables>Convert and select Table to Text, using Tabs as your separator. Select the whole document, go to Edit>Replace, and enter ^t=^t^p as your find what, nothing for your replace with, and select replace all. That will remove all the lines without entries.
You now have a text document ready to save and import into InstantText using the Formula import choice. (If using a different expander, you can modify the above directions to get whatever format your program of choice requires for import.)
Do be careful in checking what you get back from OneLook on a phrase search, as some things may appear in several versions due to spelling errors in some of the sources it checks. However, with a little intelligent editing, you can save yourself a lot of typing making up a phrase set like this.