Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"qua danh can snippets" » "qua dan can snippets", "luan danh can snippets", "luat danh can snippets", "qua danh ca snippets", "qua danh cau snippets", "qua danh nhan 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: (((("qua danh 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: (((("qua danh can snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( qua danh can snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("qua danh can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.