Perhaps you should try some spelling variations:
nang dai » nang tai, lang dai, nang cai
nang dau » hang dau, xang dau, nang du
cac tuc » cac toc, cac tu, cac tac
cau doi » cau hoi, cau do, cau noi
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
va cau » van cau, va dau, va cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky ((nang dai) or (nang dau)) hoi. lieu va cac tuc va cau doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky ((nang dai) OR (nang dau)) hoi. lieu va cac tuc va cau doi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((nang dai) or (nang dau)) hoi. lieu va cac tuc va cau doi cua tre*.