Hi Martha

There are some differences between databases on how searches work and these require some database configurations as documented.

There are some limitations in some databases on searching for full words (morphological searches) e.g. in MySQL installing Ngram can help this.

Alternatively all databases support wildcard character for the end of full words so sell* should find the first example

The second example board*  or *board*  won't find this as the full word is onboarding so would need to use onb* 

Let us know how you go.

regards