Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
hieu ve » hieu van
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky nang x hoi. ((hieu ve) OR (hieu va)) cham thuc va danh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang x hoi. ((hieu ve) OR (hieu va)) cham thuc va danh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang x hoi. ((hieu ve) OR (hieu va)) cham thuc va danh vi cua tre*.