Perhaps you should try some spelling variations:
"nhin viet code snippets" » "nhan viet code snippets", "nghia viet code snippets", "chinh viet code snippets", "nhin viet co snippets", "nhin viet some snippets", "nhin viet code slippers"
"python using a snippets" » "python using a 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: (((("nhin viet code snippets") or ("python using a snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nhin viet code snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nhin viet code snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhin viet code snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.