The problems with your search strategy has been covered by comments and answers posted earlier. I am offering a solution for your problem which involves the use of regex library, along with the find_all() function call:
import requests
from bs4 import BeautifulSoup
import re
res = requests.get("https://www.jobberman.com/jobs")
soup = BeautifulSoup(res.text, "html.parser")
company_name = soup.find_all("a", href=re.compile("/jobs\?"), rel="nofollow")
for i in range(len(company_name)):
print(company_name[i].text)
Output:
GRATIAS DEI NIGERIA LIMITED
Balkaan Employments service
Fun Science World
NEIMETH INT'L PHARMACEUTICALS PLC
Nkoyo Pharmaceuticals Ltd.
...
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