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