Perhaps you should try some spelling variations:
"sung theo cac snippets" » "dung theo cac snippets", "song theo cac snippets", "vung theo cac snippets", "sung tho cac snippets", "sung theo sach snippets", "sung thien cac 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: (((("sung theo 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: (((("sung theo cac snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sung theo cac snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sung theo cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.