First thing, I notices typo in your keywords :Auction Cars Goverment should be government.
Although you can rank high for typos it is not advisable.
Use Google keyword tool to find phrase: https://adwords.google.com/select/KeywordToolExternal
type your chosen keywords and you will receive a long list with keywords ideas, and how much they are being searched on google.
You should put the keywords in a way they make sense. You want the page to be SE friendly but people friendly too, or your readers will leave your site.
you can change "car" to "cars" auction to auctions, etc, use "a" and "the" in the phrase.
The sky is the limit. The longer your phrase is the easy it is to rank high.
My suggestion go with a 4-6 keyword phrase.
It does matter if all three keywords are in one phrase.
Let say I trying to rank for "work at home" (very hard) I want this phrase in the text in this order "work from home" if I write: "Today I stayed at home
, tomorrow I am going to work
" i did nothing to help my self. The SE can't see the phrase "work at home" an will not rank for it, never, why, because i didn't use it.