To get more specific search results, use the following tips:
Use correct spelling.
Use multiple words. Example: laser sensors
Use similar words. Example: safe secure privacy security
Use quotation marks. Example: "laser sensor"
Use plus (+) or minus (-). Example: +"laser sensor" -vision
Use wildcards. Examples: wh* or "wh* are"
Make sure your search terms are spelled correctly. The search engine will attempt to find words that sound similar to your search terms, but it's best to spell the search terms correctly.
Use multiple words
Using multiple words will return more refined results than a single word. For example, typing laser sensors will return more relevant results than typing just laser. (Keep in mind that relevant results are returned even if they don't contain all query terms.)
Example: laser sensors
Use similar words
The more similar words you use in a search, the more relevant your results will be.
Example: safe secure privacy security
Use quotation marks
Use quotation marks to find words which must appear adjacent to each other, for example, "laser sensors". Otherwise, the search results will include the words laser and sensor, but not necessarily in that order. The words may appear anywhere, and in any order, within the document.
Example: "laser sensors"
Use plus (+) or minus (-)
Use a plus sign when your search word or phrase must appear in the search results. Use a minus sign when your search word or phrase must not appear in the search results. The plus sign tells the search engine that a certain word or phrase is required in the search results, and a minus sign indicates that a word or phrase must be absent in the search results.
Note: A phrase must be contained within quotation marks. Leave no spaces between the plus or minus sign and the term.
Example: +"laser sensor" -vision
Wildcard searches can expand the number of matches for a particular request. The * character is used as the wildcard character.
For instance, searching for wh* will find the words what, why, when, whether, and any other word that starts with wh.
Searching for *her* will find the words here, whether, together, gathering, and any other word that contains her anywhere in the word.
Wildcards may be combined with the standard plus (+) and minus (-) modifiers and quotes for phrases. +wh* -se*ch will find all pages which have a word that starts with wh and which does not contain a word that starts with se and ends with ch. "wh* are" will find the phrases where are, what are, why are, etc.