Perhaps you should try some spelling variations:
"duong hoa code snippets" » "duong khoa code snippets", "dong hoa code snippets", "duong hoi code snippets", "duong hoa co snippets", "duong hoa cong snippets", "duong hoa code slippers"
"using a code snippets" » "using a code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code 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: (((("using a code snippets") or ("duong hoa code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using a code snippets") OR ("duong hoa code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using a code snippets ) or ( duong hoa code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using a code snippets") or ("duong hoa code snippets"))) or ("locating bug code snippets"))*.