Perhaps you should try some spelling variations:
"dong nghe cnc snippets" » "cong nghe cnc snippets", "dang nghe cnc snippets", "dong nghiep cnc snippets", "dong nghe cong snippets", "dong nghe che snippets", "dong nghe co snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dong nghe cnc snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong nghe cnc snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong nghe cnc snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong nghe cnc snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.