Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luu dan du snippets" » "luu van du snippets", "luu hanh du snippets", "luat dan du snippets", "luu dan dau snippets", "luu danh du snippets", "luu 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: (((("luu 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: (((("luu dan du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luu dan du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luu dan du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.