Perhaps you should try some spelling variations:
"duong quan 2 snippets" » "duong quang 2 snippets", "duong qua 2 snippets", "luong quan 2 snippets", "duong quan 12 snippets", "duong quan y snippets", "duong quan _ snippets", "duong quan 2 slippers"
"python using java snippets" » "python using data snippets", "python using java slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("duong quan 2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duong quan 2 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duong quan 2 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duong quan 2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.