Perhaps you should try some spelling variations:
"van doan tinh snippets" » "van doan hinh snippets", "van ban tinh snippets", "van quan tinh snippets", "van doanh tinh snippets", "van toan tinh snippets", "van hoan tinh 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: "((((\"python using a slippers\") OR (\"van doan tinh snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( python using a slippers ) OR ( van doan tinh snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("python using a slippers") OR ("van doan tinh snippets"))) OR ("locating bug code snippets"))*.