Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van toi cay snippets" » "van tai cay snippets", "van thi cay snippets", "van toan cay snippets", "van doi cay snippets", "van toi cac snippets", "van voi cay 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 toi cay 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 toi cay snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van toi cay snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van toi cay snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.