Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"he toan hoc snippets" » "he toan khoa snippets", "he van hoc snippets", "he hoa hoc snippets", "ke toan hoc snippets", "he than hoc snippets", "le toan hoc 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 (\"he toan hoc snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( python using java snippets ) OR ( he toan hoc snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") OR ("he toan hoc snippets"))) OR ("locating bug code snippets"))*.