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