Basically this is how I build out my ‘best’ key word phrases –
First –
Phrases that include the product name or brand itself.
buyer phrases:
o Truthaboutabs Review
o Truthaboutabs Bonus
o Truthaboutabs Product
o Buy Truthaboutabs
o Truthaboutabs Discount
o  xyz scam

Second way to add to list–
Other Branded Phrases or Specific product names within that niche.

Third source–
Other nouns or more specific PHYSICAL items that people would be looking to buy
(words related to the niche like ‘products’, ‘systems’, ‘supplements’,
‘machines’, etc).

Then can target the actual domain names to buy, and start PPC campaigns.

Good Luck!

Chris.