Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngu hanh he snippets" » "ngu anh he snippets", "ngu danh he snippets", "luu hanh he snippets", "ngu hanh che snippets", "ngu hanh ve snippets", "ngu hanh de 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: (((("ngu hanh he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ngu hanh he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngu hanh he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngu hanh he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.