Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"so lieu toan snippets" » "so bieu toan snippets", "so hieu toan snippets", "so kiem toan snippets", "so dieu toan 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: (((("so lieu toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("so lieu toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( so lieu toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("so lieu toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.