Add a “retrieve from database” microflow action to you microflow and add an xpath constraint where you use either the xpath constraint function “contains” or “starts-with” as so:
[contains(<Attribute>, $SearchHelper/SearchText] or [startsWith(<Attribute>, $SearchHelper/SearchText)]
You can have multiple contains and startsWith in one Xpath constraint, but please note that extensive use of contains might impose a performance punishment if you are searching over large datasets.