In this blog I had explained how to manage and use query suggestion in sharepoint online search service
Login to the SharePoint Online Site
Navigate to admin center -> under admin center click SharePoint admin center
Open Search service in the window
Click “Query suggestion settings”
Enable “Show search suggestions”
Provide the language for suggestion phrases “am go for English”
Now am going to create a simple text file contains “Phrases” for effective search
Save the file
Now click the Import from text file option under always suggest phrases
Pick the file already saved
Click Ok to upload
You can also restrict some phrases using never suggested phrases option
Click save settings to complete
After successful search crawl
Type “Visual” it will suggest some phrases related to keyword entered in the search input
Then type “sharepoint”
Happy sharepointing!….