Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet nhat de snippets" » "biet nhat de snippets", "tiet nhat de snippets", "viet nam de snippets", "viet nhat ve snippets", "viet nhat le snippets", "viet chat deo 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 nhat de 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 nhat de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet nhat de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet nhat de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.