Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"con hoc voi snippets" » "co hoc voi snippets", "mon hoc voi snippets", "toan hoc voi snippets", "con hoc vi snippets", "con hoc vo snippets", "con 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: (((("con 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: (((("con hoc voi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( con hoc voi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("con hoc voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.