Perhaps you should try some spelling variations:
dang xay » dang van
nam thuc » nam thuoc, am thuc, nam thu
tinh doi » trinh doc, trinh do, tinh hoc
cua nuoc » cua quoc, cua nguoi, cua thuoc
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va tinh » may tinh
doi cua » dai cua, hoi cua
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty ((dang xay) OR (van xay)) hoi. hieu va nam thuc va tinh doi cua nuoc~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty ((dang xay) OR (van xay)) hoi. hieu va nam thuc va tinh doi cua nuoc".
• Adding a wildcard symbol may retrieve word variants: vu sach ty ((dang xay) OR (van xay)) hoi. hieu va nam thuc va tinh doi cua nuoc*.