Search for several texts and return a spesific text

Ok, this is a great challange! Honor to the one who solves this one

I'm making a budget.
I want to sort my spendings into categories. My spendings are downloaded as a spreadsheet from my bank. It looks like this:

Details	Sum	Category
VISA Mc Donalds	-130,00
138766 Statoil	-640,00
76234 TAXI 20141127	-357,00
23454 BurgerKing	-130,00

The categories in this example would be:

lunch

gas

Now, I want to search for multiple strings in the A-column and return the correct category for each spending. F.x: I will search for texts like "donalds","burger","oil". If no match is found, the return value should be an empty string. The result should look like:

Details	Sum	Category
VISA Mc Donalds	-130,00	lunch
138766 Statoil	-640,00	gas
76234 TAXI 20141127	-357,00
23454 BurgerKing	-130,00	lunch

I have tried

Formula:

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, but I have only been successful with searching for one string. Using macro is an option, but I want to try solving this one without use of macro.

I'll be greatful for all the help you can provide!

Are you kidding me!? Thanks a lot AlKey! That was exactly what I needed

..but what is the purpose of the "25^25"?