14. The computer-assisted method of claim 1 , further comprising: obtaining document properties or property values related to the documents in the first search result by the computer system; displaying, in the user interface, the document properties or property values related to the documents in the first search result in response to each character being entered in the query; and allowing the user to select at least one of the document properties or property values, wherein the second search result is obtained based on the query, the first context term, and the at least one of the document properties or property values selected by the user.
14. The computer-assisted method of claim 1 , further comprising: obtaining document properties or property values related to the documents in the first search result by the computer system; displaying, in the user interface, the document properties or property values related to the documents in the first search result in response to each character being entered in the query; and allowing the user to select at least one of the document properties or property values, wherein the second search result is obtained based on the query, the first context term, and the at least one of the document properties or property values selected by the user. 15. The computer-assisted method of claim 14 , wherein the document properties comprise file types, file locations, file creation date, file publishing date, author, or other metadata of the documents, wherein the property values comprises a specific file type, a specific date, a specific author name, or other specific information under a corresponding document property; wherein the number of documents having each document property or property values is dynamically displayed in the user interface in association with the respective document property or property value.