Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thanh de » hanh de, thanh ve, thanh do
va thanh » gia thanh, ban thanh, va tinh
cay phoi » cap phoi, tay hoi, cay cho
bach ky » bac ky
cua tuc » cua tu, cua thuoc, luat tuc
thuc va » thuc vat, thuc dan, thuc day
cua duc » cua nuoc, cua quoc
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, gay thoi
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu bach ky dang ((xay hoi) OR (cay phoi)). hieu ve nam thuc va thanh de ((cua tuc) or (cua duc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ky dang ((xay hoi) OR (cay phoi)). hieu ve nam thuc va thanh de ((cua tuc) OR (cua duc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu bach ky dang ((xay hoi) OR (cay phoi)). hieu ve nam thuc va thanh de ((cua tuc) or (cua duc))".
• Adding a wildcard symbol may retrieve word variants: vu bach ky dang ((xay hoi) OR (cay phoi)). hieu ve nam thuc va thanh de ((cua tuc) or (cua duc))*.