1. Logic AND/OR: AND, OR
☆ Note that AND, OR must be capitalized, otherwise they are considered ordinary words, not search instructions.
☆ Unlike normal programming languages, the OR instruction takes precedence over the AND instruction.
☆ Abbreviation: AND instruction is generally replaced by a space, not clearly written. In addition, the AND command can be replaced with +. The OR directive can be replaced by |.
☆ Example: Inverted or Signature files or file or index, it is equivalent to (Inverted or Signature) (files or file or index)
2. Logic not: -
☆ Example: Search engine history - Culture - Chinese history - World history
3. Complete match:" ... "
☆ Example:" world war I" Search for World War I
4. Wildcard: *?
☆ In keeping with our usual custom, "*" represents a series of characters, "?" Represents a single character.
☆ Example: progr? m
☆ Tip: Don't expect Google to be available via progr? m searches for program because progr and m are treated as separate words, and one character is allowed between the two words, that's all.
5.site: Search for a website or domain name
☆ Example: Search engine tips site:edu.cn
☆ This means a page on the Chinese Education and research website (edu.cn) about search engine skills.
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