1. Establish a huge talent pool: HR headhunting companies usually have a huge talent pool with information about candidates from all walks of life. They collect and sort out candidates' resumes and personal data through various channels, including recruitment activities, online recruitment websites, social media, industry associations and so on.

2. Actively look for potential candidates: HR headhunting company actively looks for potential candidates. They use professional networks, social media and personal relationships to actively establish contact with potential candidates and invite them to participate in the interview and recruitment process.

3. Market research and search: headhunting companies conduct market research to understand the supply and demand of talents in various industries. They will communicate with corporate customers to understand their recruitment needs and job requirements, and then search and filter in their talent pool to find qualified candidates.

4. Professional brokers and network expansion: Some headhunting companies have professional brokers who build relationships with candidates and help them find new career opportunities. These brokers have accumulated a lot of talent resources through cooperation and recommendation with candidates.

To sum up, headhunting companies can find a large number of resumes and candidate resources by establishing a huge talent pool, actively looking for candidates, market research and search, and the support of professional brokers. They use these resources to meet the recruitment needs of corporate customers, while Ubisoft searches for suitable talents in official website.