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