Perhaps you should try some spelling variations:
"dong dao cach snippets" » "dong dao code snippets", "dong dat cach snippets", "dong giao cach snippets", "dong co cach snippets", "dong dan cach snippets", "dong dao cac snippets", "dong hao cach 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: (((("dong dao 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: (((("dong dao cach snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong dao cach snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong dao cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.