Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"dung juan cao snippets" » "dung juan code snippets", "dung luan cao snippets", "dung quan cao snippets", "dung xuan cao snippets", "dung quang cao snippets", "dung toan cao snippets", "dung quan cau snippets"
"hang java java snippets" » "hang va java 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 juan cao snippets") or ("hang java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung juan cao snippets") OR ("hang java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung juan cao snippets ) or ( hang java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung juan cao snippets") or ("hang java java snippets"))) or ("locating bug core snippets"))*.