If the post you're looking for is older than 7 days you can use [SEDE](http://data.stackexchange.com/). For example this [query](http://data.stackexchange.com/stackoverflow/query/534139?search=database&UserId=393087) will search the Q/A pairs you participated in for a given word.

<!-- language: lang-sql -->

    ;with allQs as 
    (
        select coalesce(parentid,id) as postid
        from posts p
        where owneruserid = ##userid:int?393087##
    ) 
    select id as [Post Link]
         , owneruserid as [User Link]
         , creationdate
         , score
    from posts p
    inner join allQs q on q.postid = p.parentid 
    where p.body like '%' + ##search:string?database## +'%'
    and p.owneruserid <> ##userid:int?393087##
    union
    select id as [Post Link]
         , owneruserid as [User Link]
         , creationdate
         , score
    from posts p
    inner join allQs q on q.postid = p.id
    where p.body like '%' + ##search:string?database## +'%'
    and p.owneruserid <> ##userid:int?393087##

When run today this will be your result:

[![enter image description here][1]][1]

Keep in mind SEDE is only [updated once a week](http://meta.stackexchange.com/a/145732/152859).


  [1]: https://i.sstatic.net/MUf3i.png