Perhaps you should try some spelling variations:
sach kem » hanh kem
danh di » danh du, xanh di, danh dien
danh vi » hanh vi, dinh vi, danh va
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
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: tu ((sach kem) or (sac ky)) nang ma hoi. hieu va cac duc va ((danh vi) or (danh di)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach kem) OR (sac ky)) nang ma hoi. hieu va cac duc va ((danh vi) OR (danh di)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach kem) or (sac ky)) nang ma hoi. hieu va cac duc va ((danh vi) or (danh di)) cuu tre*.