The most reliable way to obtain a full copy of your search data is through the Google Account Help recommended process:

: For advanced users, the History file is stored locally on your computer in an SQLite3 format, which can be exported as a CSV using tools like DB Browser for SQLite.

: Click Create export . Google will begin preparing your files; this can take anywhere from a few minutes to several days depending on the size of your history. Alternative: Exporting via Chrome Browser