Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet hat doi snippets" » "viet nhat doi snippets", "viet ha doi snippets", "viet dat doi snippets", "viet hoat doi snippets", "viet thay doi snippets", "viet hang doi 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 hat doi 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 hat doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet hat doi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet hat doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.