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