Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khao cuu tre snippets" » "cham cuu tre snippets", "chao chu tre snippets", "kho cua tre snippets", "khao cua tre snippets", "khao cau tren snippets", "khao cau treo 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: (((("khao cuu tre snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khao cuu tre snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khao cuu tre snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khao cuu tre snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.