Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dong van he snippets" » "duong van he snippets", "dang van he snippets", "dong von he snippets", "dong van hoe snippets", "dong van hue snippets", "dong van de 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 van he 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 van he snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong van he snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong van he snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.