The Online Help Search (normally) works with searches of four (or more) letters
If you enter a word such as “Trim” all instances of the word “Trim” are returned but words containing “Trim” are ignored
To search for “Trimmed” or “Trimming” it is possible to use - Trim* (with the Asterix)
The use of the asterix will allow the return of words CONTAINING “Trim”
The use of the asterix before and after a word allows the search for even three letter words - *rim* - and will return “Trim”, “Trimmed” and “Trimming”
N.B. This method will also return words such as “Primary” and “Experiment”