Perhaps you should try some spelling variations:
"hang cong code snippets" » "dang cong code snippets", "hang nong code snippets", "thanh cong code snippets", "hang cong cong snippets", "hang cong co snippets", "hang cong che snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code slippers" » "locating bung code slippers", "locating bugs code slippers"

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: (((("hang cong code snippets") or ("dung java java snippets"))) or ("locating bug code slippers"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hang cong code snippets") OR ("dung java java snippets"))) OR ("locating bug code slippers")).
• Removing quotes may allow a broader search: (((( hang cong code snippets ) or ( dung java java snippets ))) or ( locating bug code slippers )).
• Adding a wildcard symbol may retrieve word variants: (((("hang cong code snippets") or ("dung java java snippets"))) or ("locating bug code slippers"))*.