Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van mon hoc snippets" » "dan mon hoc snippets", "van bon hoc snippets", "van man hoc snippets", "van toan hoc snippets", "van dong hoc 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: (((("van mon hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van mon hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van mon hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van mon hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.