Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"trinh dan du snippets" » "trinh han du snippets", "trinh van du snippets", "trinh san du snippets", "trinh dan dau snippets", "trinh danh du snippets", "trinh dan su 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: (((("trinh dan du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh dan du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh dan du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh dan du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.