Perhaps you should try some spelling variations:
"hoang nam de snippets" » "hoang nham de snippets", "hoang van de snippets", "quang nam de snippets", "hoang nam da snippets", "hoang nam do snippets", "hoang nam he 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: (((("hoang nam de snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoang nam de snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoang nam de snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoang nam de snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.