How do I search for bookmarks with "tag1 OR tag2 OR tag3..."?...

In Diigo, there is an "Advanced Search" for your own bookmarks. It used to be a directly accessible drop-down menu but since the majority of users just rarely uses advanced search features, the "Advanced Search" was put into a place accessible only *after* having performed a standard search. So, if the standard search does not give you the results you want, then you can refine your search with the advanced search features.

To access the "Advanced Search", you need to perform a standard search using the search field and search button in the upper right corner of the webpage you see after being logged in. Then, you get search results for Diigo, your bookmarks only and everyone's bookmarks, which you can select by clicking on the appropriate tab. After selecting "My bookmark only" you will see the clickable word "Advanced" next to the search button in the upper third of the webpage. Click this word and the advanced search field will open. Use the boolean operator OR to find results which contain any word of your list of terms.

By using the appropriate search syntax, you can access the advanced search features directly (as shown above for the tags). But this works just as well for all other fields, such as:
url:(term1 OR term2 OR term3 ...)

Highlighted by aquadragon1984

To access the "Advanced Search", you need to perform a standard search using the search field and search button in the upper right corner of the webpage you see after being logged in. Then, you get search results for Diigo, your bookmarks only and everyone's bookmarks, which you can select by clicking on the appropriate tab. After selecting "My bookmark only" you will see the clickable word "Advanced" next to the search button in the upper third of the webpage. Click this word and the advanced search field will open. Use the boolean operator OR to find results which contain any word of your list of terms.

Highlighted by rh3el3