Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hoc hoan doi snippets" » "hoc hoa doi snippets", "hoc han doi snippets", "moc hoang doi snippets", "hoc hoat doi snippets", "hoc hoang dai 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 hoan 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 hoan doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc hoan doi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc hoan doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.