Perhaps you should try some spelling variations:
"dung luan cong snippets" » "dung luan code snippets", "dung luat cong snippets", "dung luong cong snippets", "dung luan chung snippets"
"locating bug core snippets" » "locating bug code snippets"
"using java can snippets" » "using java code snippets", "using data can snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("using java can snippets") or ("dung luan cong snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java can snippets") OR ("dung luan cong snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( using java can snippets ) or ( dung luan cong snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java can snippets") or ("dung luan cong snippets"))) or ("locating bug core snippets"))*.