Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dong tin can snippets" » "thong tin can snippets", "luong tin can snippets", "dong kinh can snippets", "dong tinh can snippets", "dong tin cac snippets", "dong tiep can 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 tin can 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 tin can snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong tin can snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong tin can snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.