Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet ta hoc snippets" » "viet tay hoc snippets", "viet ha hoc snippets", "viet tu hoc snippets", "viet tai hoc snippets", "viet tam hoc snippets", "viet te hoc 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 ta hoc 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 ta hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet ta hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet ta hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.