Some of the best English-speaking courses for technical English, tailored for professionals needing specialized vocabulary in their fields, include:

1. Technical English Courses: Look for programs specifically designed to help professionals in technical fields improve their English skills. These courses focus on industry-specific terminology, communication styles, and writing skills.

2. Business English Courses: Many business English courses cater to professionals and can be highly beneficial for individuals in technical occupations. These courses often cover communication in the workplace, professional emails, presentations, and meetings – all skills that are essential for technical professionals.

3. Online Platforms: Websites like Coursera, edX, and Udemy offer technical English courses that cater to professionals. Look for courses taught by reputable instructors or institutions that focus on technical English language skills.

4. English for Specific Purposes (ESP) Courses: ESP courses are designed to meet the specific language needs of professionals in various fields, including technical fields. These courses can enhance your ability to communicate effectively in your area of expertise.

5. Institutional Training: Some universities and language schools offer specialized technical English courses that can be more intensive and comprehensive, providing in-depth training in technical vocabulary and communication skills.

6. Professional Development Programs: Check if your industry associations or employers offer any professional development programs that include technical English training. These programs can be customized to target the specific language needs of professionals in your field.

When selecting a course, consider your specific needs, learning style, and time availability.