Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dong tham so snippets" » "dong tam so snippets", "hong tham so snippets", "dong thap so snippets", "dong ham so snippets", "dong tham do snippets", "dong than so 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: (((("dong tham so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong tham so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong tham so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong tham so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.