The search is a so-called "Boolean full text search" for which the following operators are available:
The * (asterisk) serves as a placeholder and can be placed at the beginning and/or end of a word. For words longer than three characters, the wildcard is automatically appended to provide as many search results as possible.
To extend the above examples,
A search with quotation marks will only return search results that contain the searched word or phrase in exactly this form.
Within the quotation marks again the asterisk may be used, such as
The asterisk can also replace whole words within a sequence of words.
A search with quotation marks followed by a ~ (tilde) and a number will only return search results where the words searched for occur between the quotation marks within x words of each other.
A search with quotation marks followed by a / (forward slash) and a number will only return lots where at least x words of the words between the quotation marks are found, regardless of combination and order. If the matches are additionally sorted by relevance, those matches with the most matching words appear at the top.
Brackets are used to group words into subexpressions. Groups in brackets can be nested.
A search for
A leading - (minus) indicates that the following word must not appear in the delivered search results.