Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong may hoc snippets" » "cong xay hoc snippets", "cong ma hoc snippets", "cong hay hoc snippets", "cong day hoc snippets", "cong may moc snippets", "cong may loc 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: (((("cong may 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: (((("cong may hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong may hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong may hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.