Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"quoc luan ve snippets" » "nuoc luan ve snippets", "quoc quan ve snippets", "quoc lan ve snippets", "quoc luat ve snippets", "quoc luan va 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: (((("quoc luan ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("quoc luan ve snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( quoc luan ve snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("quoc luan ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.