Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"luong van cac snippets" » "luong va cac snippets", "duong van cac snippets", "luong vat cac snippets", "luong van hac snippets", "luong van cau snippets", "luong 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: (((("dung java java snippets") or ("luong van cac snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("luong van cac snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( luong van cac snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("luong van cac snippets"))) or ("locating bug code snippets"))*.