The image is a page from a book or educational material, specifically focusing on "3. Trường hợp xác định." This section appears to be discussing methods for identifying cases. The page contains several illustrations and text in Vietnamese, which seems to be related to medical or educational content. 

Here's a detailed description of the elements present on the page:

1. **Illustrations**: There are several illustrations at the top of the page, which might represent different scenarios or examples related to the topic discussed.
2. **Text**: The main body of the page contains Vietnamese text, which seems to be providing information or instructions related to the topic. The text is organized into paragraphs, and there are bullet points or numbered lists.
3. **Additional Elements**: There are some additional elements such as a green border around the page, which could indicate it is a special section or a highlighted part of the document.

Based on the description, this page seems to be part of an educational or instructional guide, possibly for medical