Perhaps you should try some spelling variations:
danh dien » dinh dien, danh kien, danh lien
tham duc » pham duc, tham du, than duc
tu sach » thu sach, su sach, te sach
xanh di » danh di, vanh dai, xanh tai
va tham » van tham, va cham, va thanh
sach va » sach xa, sach ha, sach dao
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa

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 va ((nang xa) or (nang ma)) hoi. hieu va tham duc va ((danh dien) or (xanh di)) cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach va ((nang xa) OR (nang ma)) hoi. hieu va tham duc va ((danh dien) OR (xanh di)) cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sach va ((nang xa) or (nang ma)) hoi. hieu va tham duc va ((danh dien) or (xanh di)) cua vat*.