OD 系統維護

- All words: Returns only documents that match all words.
- Any word: Returns documents that match any word.
- Exact Phrase: Returns only documents that match the exact phrase entered.
- Phrase Prefix: Works like the Exact Phrase mode, except that it allows for prefix matches on the last term in the text.
- Wildcard: Returns documents that match a wildcard expression.
- Fuzzy query: Returns documents that contain terms similar to the search term. For example: If you search for Kolumbia. It will return search results that contain Columbia or Colombia.