Hi @nekoniaow,
Okay, I found an Amazon page for a supply for your netbook that lists a different size for that connector.
[link|https://www.amazon.com/Power4Laptops-1015PN-PU17-WT-1015P-WHI040S-1015PW-MU17-GD-1015PW-MU17-PI/dp/B00IGXACMO|Amazon.com: Power4Laptops DC Adapter Laptop Car Charger Compatible with Asus Eee PC 1015PN-PU17-WT : Electronics|new_window=true]
According to that listing, here's the size of the plug you need.
[quote]* Plug Size: 2.5mm X 0.7mm[/quote]
Those plugs were pretty easy to find; here's one of the first I ran into.
[link|https://www.amazon.com/uxcell-Connector-2-5mm-0-7mm-Adapter/dp/B07FRXVPFH|uxcell 5Pcs DC Male Connector 2.5mm x 0.7mm Power Cable Jack Adapter Black - - Amazon.com|new_window=true]
Hopefully that's more what you were looking for.