Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet vi hoc snippets" » "viet voi hoc snippets", "diet vi hoc snippets", "viet gi hoc snippets", "viet li hoc snippets", "viet va hoc 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 vi hoc 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 vi hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet vi hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet vi hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.