Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"do kiet doan snippets" » "do ket doan snippets", "do kieu doan snippets", "do kiem toan snippets", "do viet doan snippets", "doi kien doan snippets", "don kien doan 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: (((("do kiet doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("do kiet doan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( do kiet doan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("do kiet doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.