Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doc van canh snippets" » "doc van anh snippets", "doc van hanh snippets", "doc van manh snippets", "do van canh snippets", "hoc van canh snippets", "duc van 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: (((("doc 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: (((("doc van canh snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doc van canh snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doc van canh snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.