Perhaps you should try some spelling variations:
"dung using java snippets" » "dung ung java snippets", "dung sinh java snippets", "dung uong java snippets", "dung using data snippets", "dung using java slippers"
"dong nhan code snippets" » "dung nhan code snippets", "cong nhan code snippets", "dong chan code snippets", "dong nhan co snippets", "dong nhan con snippets", "dong nhan code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code 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 using java snippets") or ("dong nhan code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung using java snippets") OR ("dong nhan code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung using java snippets ) or ( dong nhan code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung using java snippets") or ("dong nhan code snippets"))) or ("locating bug code snippets"))*.