The image appears to be a page from a book or document, specifically focusing on "Realistic PCR" and "Realistic PCR" in Vietnamese. The page is divided into four sections, each containing text in Vietnamese. Here is a summary of the content:

1. **Section 3**: This section discusses "Xác định". It mentions that Realistic PCR is used for identifying specific DNA sequences.
2. **Section 4**: This section focuses on "Loại trù". It explains that Realistic PCR is used for detecting specific RNA sequences.

The text is written in Vietnamese and seems to provide information about the use of Realistic PCR in identifying specific DNA and RNA sequences.