To search for items containing several terms, separate terms by spaces.
tomorrow planning
To search for a term which begins with some characters, add a star at the end. For example, to search for plan, planning or planner, you can use the search:
plan*
To search for an exact combination of words, surround them with double quotes:
"tomorrow planning"
To search for a tag, prefix it with a number sign (or hashtag):
#planning
To search for a term and exclude another term, prefix the term to exclude with a minus sign:
planning -tomorrow
Example: search for items which contain exactly tomorrow planning and also a term starting with rep and are tagged with important and do not contain the term done:
"tomorrow planning" rep* #important -done
Note: search is case-insensitive and ignores accents.