Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"mach cho hoc snippets" » "mach cao hoc snippets", "danh cho hoc snippets", "dac cho hoc snippets", "mach co hoc snippets", "mach khoa 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: (((("mach cho 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: (((("mach cho hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( mach cho hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("mach cho hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.