Several search techniques that cannot be left unknown when using a search engine

1. Search several keywords at the same time: keywords are separated by spaces. For example, "China History" searches for webpages that display both Chinese and historical words.

2. exclude a keyword: add the minus sign before the excluded word. For example, "Chinese history-Qing Dynasty" will filter webpages with the words "Qing Dynasty ".

3. Force Search for a word: Add a plus sign to the front, for example, "+ China Beijing"

4. Fuzzy search (replaced by a wildcard): for example, "Never stop"

5. Search for fixed sentences: Double quotation marks

6. Search for one or more words: keywords are separated by or, for example, "China or history"

7. Search for a type of file, such as "filetype: Doc or filetype: XLS or filetype: ppt"