This is pretty simple but may help some of you. When I enter a niche. I look at the top 3 sites in Google for the main keyword I am targeting. So say the keyword is "Cheap tickets" I go to the top site and open the home page and hit Ctrl & F on my keyboard. This opens the find box and then I put in the first word "cheap" this word will pop up loads of times. So doing this I have come up with; cheap airfare cheap flights cheap hotels cheap new york hotels cheap car rentals cheap cruises cheap vacations cheap travels deals I can then enter these as LSI keywords on my site and target them if I want to.