Perhaps you should try some spelling variations:
"yang zhang cho snippets" » "yan zhang cho snippets", "cang thang cho snippets", "lang thang cho snippets", "yang hang cho snippets", "yang sang cho snippets", "yang phong cho snippets"
"dung java java snippets" » "dung va java 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 ("yang zhang cho snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("yang zhang cho snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( yang zhang cho snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("yang zhang cho snippets"))) or ("locating bug code snippets"))*.