Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"co viet que snippets" » "co viet qua snippets", "co viet quy snippets", "co viet quan snippets", "so viet que snippets", "o viet que snippets", "hoc viet que 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: (((("co viet que snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("co viet que snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( co viet que snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("co viet que snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.