Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hoc khi doi snippets" » "hoc khoi doi snippets", "hoc khia doi snippets", "hoc ki doi snippets", "hoc khi dai snippets", "hoc khi hoi snippets", "hoc khi moi 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 doi 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 doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc khi doi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc khi doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.