Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doc toan hoc snippets" » "duc toan hoc snippets", "doc than hoc snippets", "ngoc toan hoc snippets", "doc toan khoa snippets", "doc van hoc snippets", "doc hoa hoc snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("doc toan hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doc toan hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doc toan hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doc toan hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.