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