Here is the step-by step process for building this search:

- the "key" words in the search, including synonyms (that is, words with the same meaning) are:

 hybrid, electric, car, automobile

- the boolean connector "OR" will combine terms with similar meanings:

hybrid or electric

car or automobile

- need to use parenthesis, (     ), around the terms combined with the "OR":

(hybrid or electric)

(car or automobile)

 - need to use the boolean connector "AND" to require terms to appear in the results:

(hybrid or electric) and (car or automobile)

-  need to use truncation, *, to get different word endings, such as both singular and plural:

(hybrid or electric) and (car* or automobile*)