Thx, but this is a known limitation:
'3D' is not considered a word and thus filtered out by the tokenizer.
'3d' could be a part of a math formula.
The resulting file is transferred to the browser so it has to be small (fast to search).

All terms have to be on the page (sphinx/themes/basic/search.html):

Note that the search function will automatically search for all of the words.
Pages containing fewer words won't appear in the result list.