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