Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
danh dai » danh dau, danh di, danh sai
nang tai » hang tai, tang tai, sang tai
truc va » thuc va, trung va
tai hoi » tai khoi, dai hoi, tai hai
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sac ky) or (sach y)) nang tai hoi. hieu van cham ((thuc vat) or (truc va)) danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sac ky) OR (sach y)) nang tai hoi. hieu van cham ((thuc vat) OR (truc va)) danh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc ((sac ky) or (sach y)) nang tai hoi. hieu van cham ((thuc vat) or (truc va)) danh dai cua tre*.