Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
qua tham » qua cham, qua than, qua thanh
ky danh » ky anh, ky dang
danh xa » danh ca, dinh xa, canh xa
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
so viet » hoc viet
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky danh xa hoi. hieu qua tham thuc va danh vi ((su viet) OR (so viet))~.
• Adding a wildcard symbol may retrieve word variants: su sac ky danh xa hoi. hieu qua tham thuc va danh vi ((su viet) or (so viet))*.