The building blocks of a search strategy are terms. Your search strategy should contain both Subject Headings and Keywords (or text words).
Subject Headings are a standardized set of terms (called a controlled vocabulary) used to describe the content of a resource in a database. This is known as indexing.
Keywords are terms that appear somewhere within the resource (e.g. title, abstract, or author keywords). Searching by a keyword will retrieve resources where the author(s) used that specific term.
You can identify either subject headings or keywords in multiple ways.
Note: not all search terms will map to an appropriate subject heading. In this case, search for it as a keyword. This option is available after the list of subject headings in most databases.
Truncation and wildcards can be applied to a keyword search in a database or search engine to broaden your results and allow you to look for variations of words.
The truncation symbol can be used in a keyword search to retrieve alternate word endings
Wildcards are symbols that can optionally replace a single letter in a word