Perhaps you should try some spelling variations:
"data using java snippets" » "data using data snippets"
"dung luat cong snippets" » "dung luan cong snippets", "dung quat cong snippets", "dung cua cong snippets", "dung thuat cong snippets", "dung luat chung 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 luat cong snippets") or ("data using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung luat cong snippets") OR ("data using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung luat cong snippets ) or ( data using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung luat cong snippets") or ("data using java snippets"))) or ("locating bug code snippets"))*.