Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hoc khi con snippets" » "hoc khoi con snippets", "hoc khia con snippets", "hoc ki con snippets", "hoc khi cong snippets", "hoc chi con snippets", "hoc khi co 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: (((("hoc khi con snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoc khi con snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc khi con snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc khi con snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.