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