Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thuc may » thuc day, truc may, phuc may
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
ty dang » ty xang, ky dang, ty hang
xay hoi » tay hoi, cay phoi, gay thoi
hieu va » lieu va, hieu qua
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 hoi) OR (xa hoi)). hieu va nam thuc may tinh doi cua nuoc~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty dang ((xay hoi) OR (xa hoi)). hieu va nam thuc may tinh doi cua nuoc".
• Adding a wildcard symbol may retrieve word variants: vu sach ty dang ((xay hoi) OR (xa hoi)). hieu va nam thuc may tinh doi cua nuoc*.