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