[Python] How to search multiple keywords in all subreddits in Reddit using PRAW in Python

I am trying to search a list of multiple key words in Reddit posts in all subreddits. At the moment my dataframe is showing just results for the last word in the keyword_list list which is 'maritime history'. Does anyone know how I can get this to search all of the words?

# Creating keyword list
keyword_list = ['maritime heritage', 'shipwreck', 'shipwrecks', 'coastal archeaology', 'maritime archaeology',
'maritime ecologies', 'marine archeaology', 'marine heritage', 'cultural marine heritage', 'marine culutral haritage', 'maritime history']

# Searching in all subreddits
all = reddit.subreddit("all")
df = pd.DataFrame() # creating dataframe for displaying scraped data

# creating lists for storing scraped data
titles=[]
scores=[]
ids=[]

# looping over posts and scraping it
for submission in all.search(keyword_list, limit=None):
titles.append(submission.title)
scores.append(submission.score) #upvotes
ids.append(submission.id)


df['Title'] = titles
df['Id'] = ids
df['Upvotes'] = scores #upvotes

print(df.shape)
df.head(10)

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