Perhaps you should try some spelling variations:
"dung quang hoan snippets" » "dang quang hoan snippets", "luong quang hoan snippets", "dung luan hoan snippets", "dung quang hoang snippets", "dung quang doan snippets", "dung quang thoai snippets"
"dang java java snippets" » "dang 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: (((("dang java java snippets") or ("dung quang hoan snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dang java java snippets") OR ("dung quang hoan snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dang java java snippets ) or ( dung quang hoan snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang java java snippets") or ("dung quang hoan snippets"))) or ("locating bug code snippets"))*.