Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van vinh hoc snippets" » "van minh hoc snippets", "van dinh hoc snippets", "van binh hoc snippets", "van sinh hoc snippets", "van hinh hoc snippets", "van tinh 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 vinh 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 vinh hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van vinh hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van vinh hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.