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how I can work with MS Word files (search text in it, write,create) in Pure C/Masm in Windows?
If you don't want to use existing libraries, you have to recreate them, it is worth a few years of work.
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i don't know how to start.
First, you need to find the files formats specifications (there is more than 1 version), unfortunately, .doc file formats are not public, so just finding them may be difficult if you are not the best friend of Bill Gates.
Once you got them, plan at least a year to fully understand them.
In other words, it is not reasonable to do what you want.
Since .docx are embedded into a .eip file format, you also need to recreate a .zip library.