I always prefer to use an external search engine. Using Google, DuckDuckGo, or any other search engine that allow parameterization, type your search query like this:
site:forum.blockland.us your search query
Is you're not familiar with the "site" parameter, it simply limits your search to a particular domain. If you want to search within a specific board, such as Modification Help, include it in your search like this:
site:forum.blockland.us "Modification Help" your search query
The quotation marks tells the search engine that any search result must contain that phrase. It's not guaranteed to limit your search to a single board, but it helps. Finally, if you want to search within a specific year, such as 2007-2010, you can do:
site:forum.blockland.us "Modification Help" 2008..2018 your search query
The ".." specifies a range of numbers to search for. Do note that given how many Blockland threads there are relative to the meager traffic the site actually gets, search engines don't index most of the Blockland Forums, so these techniques only work some of the time. If you really want to get fancy with your search parameters,
this is a good guide.