Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"trac hoc voi snippets" » "toan hoc voi snippets", "thai hoc voi snippets", "toc hoc voi snippets", "trac hoc vi snippets", "trac hoc vo snippets", "trac hoc noi 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: (((("trac hoc voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trac hoc voi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trac hoc voi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trac hoc voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.