The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

Despite my aggressive
letter-writing CAMPAIGN, I might add.
The Big Bang Theory Season 2, Episode 14

For 20 years, the spider
oversaw the CAMPAIGN to find and kill me.
Game of Thrones Season 5, Episode 8

She and I are playing
Campaign for North Africa.
The Big Bang Theory Season 11, Episode 16

Every time he would leave for the
capital or fight in a CAMPAIGN,
Game of Thrones Season 3, Episode 3

Amy has embarked on a CAMPAIGN
The Big Bang Theory Season 5, Episode 23