I want to keep shrimp as a pet, but it would always be dead in about 1 or 2 days. I read lots of information and I know that it is lack of dissolved of oxygen.
How to get the water full of dissolved of oxygen?
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Yes, you can keep shrimps in your tank, but you will want to keep shrimps away from predatory fish if you want them to reproduce.
The first thing to do is to set up your tank and cycle it properly. You can take a look here on how this is done.
You need to get an air driven sponge-filter. This is to avoid shrimps or baby shrimps to be pulled into the filter, as might happen with other filter types.
The filter will build up bacteria that convert waste into plant nutrition and it will oxygenate the water.
You will need to have several plants in your tank; this is to provide hiding places for the shrimp and baby shrimp.
Plants will use some of the waste products in your tank and convert this into additional oxygen for your shrimps.
You will need to provide good lighting in your tank for the plants to produce oxygen. Good types are fluorescent light (type Grolux in your search engine or similar) or LED lighting.
Shrimps are very sensitive for ammonia and nitrite, so this have to be kept at zero in your tank,This is why you need to cycle your tank.
Shrimps do need very little food so remember not to feed them more than 2-3 times a week. Shrimps do mostly eat waste in your tank, which are bacteria-algae-dead plants and other organic waste.
You need to do weekly water changes 10-20% each week to keep pollution to a minimum in your tank and remember to use dechlorinator water treatment (ask in the petshop for this).
All of these are the minimum requirements for keeping shrimp in your tank and as you can see in this answer no metallic objects are in use inside the tank as almost all metals are toxic to shrimp.