Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dam len toan snippets" » "dam le toan snippets", "dam dien toan snippets", "dam ke toan snippets", "dam lan toan snippets", "dau len toan snippets", "dam tien 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: (((("dam len 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: (((("dam len toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dam len toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dam len toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.