Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van dau _ slippers" » "van dao _ slippers", "phan dau _ slippers", "van dau _ slippery", "van dau _ 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: "((((\"van dau _ slippers\") OR (\"python using java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( van dau _ slippers ) OR ( python using java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("van dau _ slippers") OR ("python using java snippets"))) OR ("locating bug code snippets"))*.