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The search feature from the main page seems to be using a substring text match. For example, looking for a "vi" editor plugin, if I search for vi I get 20 pages of stuff. There are at least two projects that have keyword "vi". One approach would be to have two search buttons, one for keyword, the other for any text match. Another would be to have the keyword matches apear first in the list.
Searching by categories is now possible via a special drop down menu. It is also possible to full text search by owner, plugin name and its description. Resolving as fixed since Plugin Portal 2.0.