Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thu hang ct1 snippets" » "thi hang ct1 snippets", "thuc hanh ct1 snippets", "thu huong ct1 snippets", "thu tang ct1 snippets", "thu hang ca snippets", "thu hang cua 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: (((("thu hang ct1 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thu hang ct1 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thu hang ct1 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thu hang ct1 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.