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