Perhaps you should try some spelling variations:
"quoc hoi dan snippets" » "quoc hoa dan snippets", "quoc hoc dan snippets", "quoc hoi dap snippets"
"python using low slippers" » "python using low slippery", "python using low grippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("quoc hoi dan snippets") or ("python using low slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("quoc hoi dan snippets") OR ("python using low slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( quoc hoi dan snippets ) or ( python using low slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("quoc hoi dan snippets") or ("python using low slippers"))) or ("locating bug code snippets"))*.