Perhaps you should try some spelling variations:
danh dien » dinh dien, danh kien, danh lien
hieu van » hieu va, thien van, lieu va
danh di » danh du, xanh di, danh gia
truc va » thuc va, thuc vat, trung va
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa

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

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