Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet hoc mo snippets" » "viet goc mo snippets", "triet hoc mo snippets", "nhiet hoc mo snippets", "viet hoc moi snippets", "viet hoc mot snippets", "viet hoc mon 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 hoc mo 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 hoc mo snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet hoc mo snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet hoc mo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.