Perhaps you should try some spelling variations:
"dung hieu cach snippets" » "dung hieu code snippets", "dong hieu cach snippets", "dung tieu cach snippets", "trung hieu cach snippets", "dung hieu cac snippets", "dung chieu sach snippets", "dung hieu ca 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 hieu cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung hieu cach snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung hieu cach snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung hieu cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.