Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thi luan ve snippets" » "thi lan ve snippets", "thi xuan ve snippets", "thi loan ve snippets", "thi luat ve snippets", "thi luan va snippets", "thi quan ve 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: (((("thi luan ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("thi luan ve snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thi luan ve snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thi luan ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.