Here is an overview of what you can do with Guide searches.

plain words

find any letter that contains all of the words - in any order, in any field
format: words separated by spaces
example: lord of the rings find any entry that mentions these four words in any order

specific phrase

putting multiple words in quotes will match only that specific phrase in that word order
format: "phrase in quotes"
example: "farmer giles of ham" will not find an entry that just says "farmer giles" or "the story about Giles the farmer"

tag search

Entries have been tagged with various keywords to help find ones touching on certain topics
format: tag:descriptive-string-with-no-spaces
format: tag:"descriptive string with spaces"
example: tag:Publishing will find only entries with the Publishing tag - it will not find "publishing" mentioned anywhere else in the entry
example: tag:"The Lord of the Rings" will find entries with that multi-word tag exactly

Exclusions

You can look for entries that DO NOT match almost any of the above as well (eg "find entries that DO NOT match ...")
The general idea is that you put a minus sign - in front of things you want to exclude.
example: -edith will find entries that make no mention of "edith" in any field
example: -tag:gollum will find entries that do not have Gollum tag on them

Combining search filters

you can use any or all of the above, in any order, in your search

Other notes

• none of the search inputs are case sensitive. Feel free to capitalize if you like when typing in your search, but it doesn't matter.
  
• As mentioned above, be careful with white spaces, and use quotes as needed to keep multi-word phrases together
  
• if you have any troubles at all, let me know exactly what you searched for and what you expected to see.