Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"dong huy doc snippets" » "dong huy code snippets", "duong huu doc snippets", "dong luc doc snippets", "dong hoc doc snippets", "dong duy doc snippets", "dong huy hoc snippets", "dong huy dong snippets"
"python using java snippets" » "python using data 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 huy doc snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong huy doc snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong huy doc snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong huy doc snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.