The image appears to be a document or a page from a book, written in Vietnamese. The text is in black font on a white background. The document seems to be discussing a specific topic related to N.V.T.K. and N.L.T.T. It mentions "N.V.T.K." and "N.L.T.T." which could be abbreviations for something related to technology or engineering. The document also includes some numerical values, such as 20000 and 1500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000