Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"xuan cac du snippets" » "xuan can du snippets", "xuat cac du snippets", "xuan bach du snippets"
"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 java snippets\") OR (\"xuan cac du snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( python using java snippets ) OR ( xuan cac du snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") OR ("xuan cac du snippets"))) OR ("locating bug code snippets"))*.