1. Adjustment of product sales strategy: These brands may have decided to adopt different sales strategies in different market channels. For example, they may stop selling in some small stores and only sell in some big supermarkets, which may be because they want to focus on other market channels or launch new product lines in some stores.

2. Regional coverage restrictions: These brands may be sold in some areas, but not in some areas. This may be because their dealers in some areas do not cover all the small stores.

3. Shop selection: Some small shops may not choose to sell all shampoo brands, but only choose to sell some brands that they think are the most popular or profitable. This may be because these brands are not popular in these small shops or their profits are not high.

4. Supply chain problems: In some cases, supply chain problems may cause some goods in some stores to be out of stock. This may be the manufacturer's shortage of goods or the dealer's inventory.

In short, these shampoo brands may still be sold in some areas or some stores, but for the above reasons, they may no longer be sold in all places or all stores.