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Hello,

That is a bug we corrected since. The fulltext index used by the product search only matches the beginning of a word, so a search for 273547 found the product whose code is exactly 273547 but not the 273547 inside 80273547. And because that one product did match, HikaShop did not fall back on the "contains" search, which is why 73547, which matched nothing in the index, did return all three.

The correction is in 6.5.2, but in a build more recent than the one you have: your site runs the build of 24 July and the fix went in on 6 August. Download HikaShop 6.5.2 again from your account and install it over your current installation. The version number being the same, the Joomla updater will not offer it, so you have to download the package and install it by hand.