Perhaps you should try some spelling variations:
"do dac chieu snippets" » "do dac code snippets", "do cac chieu snippets", "do da chieu snippets", "do dao chieu snippets", "do duc chieu snippets", "do dai chieu snippets", "so dac chieu snippets"
"locating bug core snippets" » "locating bug code 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: (((("do dac chieu snippets") or ("python using java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("do dac chieu snippets") OR ("python using java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( do dac chieu snippets ) or ( python using java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("do dac chieu snippets") or ("python using java snippets"))) or ("locating bug core snippets"))*.