Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc khoa can snippets" » "duoc khoa can snippets", "duc hoa can snippets", "dac khoa can snippets", "duc khoa cam snippets", "duc khoa cap snippets", "duc khoi can 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: (((("duc khoa can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duc khoa can snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc khoa can snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc khoa can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.