Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"tang hang ca snippets" » "hang hang ca snippets", "nang hang ca snippets", "tang bang ca snippets", "tang hang va snippets", "tang nang cao snippets", "tang hang tai 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 ("tang hang ca snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("tang hang ca snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( tang hang ca snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("tang hang ca snippets"))) or ("locating bug code snippets"))*.