Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ven anh son snippets" » "van anh son snippets", "ven thanh son snippets", "viet anh son snippets", "ven anh dong snippets", "ven tinh son 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: (((("ven anh son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ven anh son snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ven anh son snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ven anh son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.