Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
va doanh » van doanh, vay doanh, va danh
nam thuc » nam thuoc, am thuc, nam thu
hieu van » thien van, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
hang xa » hoang xa, hang ca, lang xa
sach tu » sach thu, cach tu, sach ty
van cua » vang cua, ban cua, dan cua

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 tu ((hang xa) OR (hang va)) hoi. ((hieu va) or (hieu van)) nam thuc va doanh van cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu ((hang xa) OR (hang va)) hoi. ((hieu va) OR (hieu van)) nam thuc va doanh van cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu ((hang xa) OR (hang va)) hoi. ((hieu va) or (hieu van)) nam thuc va doanh van cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach tu ((hang xa) OR (hang va)) hoi. ((hieu va) or (hieu van)) nam thuc va doanh van cua vat*.