Continuing on from
@Shree, make a list of first five results.
Now figure out the keyword density of each page and make a list of all the common words/phrases that occur across all five sites. These are your LSI keywords and you are going to need to implement them into your article.
Google only knows what the keyword is about from the seed results (top 5 usually). So make sure you include the seed LSI keywords into your article.
In the early days, this was my biggest issue for onpage content.
Edit: Also tip for internal linking: add an exact/lsi from your posts to your mainkw. Then build links to your posts which include the LSI/exact.