Perhaps you should try some spelling variations:
"cac ket doan snippets" » "cac ket hoa snippets", "cac le doan snippets", "cac ket van snippets", "cao ket doan snippets", "cac ke doan snippets", "cac kieu doan snippets"
"python using a slippers" » "python using a slippery", "python using a 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"cac ket doan snippets\") OR (\"python using a slippers\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( cac ket doan snippets ) OR ( python using a slippers ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("cac ket doan snippets") OR ("python using a slippers"))) OR ("locating bug code snippets"))*.