Each search engine has its own, usually under-documented, features. which can be a real drag.
Like in:
> "Put a list of words separated by | into brackets if only one of the words must be found."
Sure ...
"skeleton* (bear* | mouflon*)" - Failed. (due to single space after '|')
"skeleton* (bear* |mouflon*)" - Works.
"skeleton* (bear*| mouflon*)" - Failed. (due to missing leading space before '|')
Search doc would be better if it would specify "OR" instead of '|'.
"skeleton* (bear* OR mouflon*)" - Works. (single-space-only after 'OR' being mandatory ... of course)