Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"quan hoc do snippets" » "quang hoc do snippets", "luan hoc do snippets", "quan doc do snippets", "quan hoc doi snippets", "quan hoc co snippets", "quan hoc bo 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: (((("quan hoc do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("quan hoc do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( quan hoc do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("quan hoc do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.