Perhaps you should try some spelling variations:
"dong quanh cac snippets" » "dong quang cac snippets", "vong quanh cac snippets", "duong quang cac snippets", "dong quang cao snippets", "dong qua cac snippets", "dong quan cau 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: (((("dong quanh 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: (((("dong quanh cac snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong quanh cac snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong quanh cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.