Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
thu sach » tu sach, thuat sach, thuoc sach
cua viet » hoa viet, cua vat, cua dieu
co sach » bo sach, cuon sach, hoc sach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
ca viet » va viet, co viet, hoa viet
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: ((thu sach) or (co sach)) ky nang x hoi. hieu ve cham thuc va hanh vi ((cua viet) OR (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (co sach)) ky nang x hoi. hieu ve cham thuc va hanh vi ((cua viet) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (co sach)) ky nang x hoi. hieu ve cham thuc va hanh vi ((cua viet) OR (ca viet))".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (co sach)) ky nang x hoi. hieu ve cham thuc va hanh vi ((cua viet) OR (ca viet))*.