Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet doc cua snippets" » "viet duc cua snippets", "viet goc cua snippets", "viec doc cua snippets", "viet hoc cua snippets", "viet doi cua snippets", "viet do cua 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: (((("viet doc cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("viet doc cua snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet doc cua snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet doc cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.