Perhaps you should try some spelling variations:
nganh xay » nganh mac, nganh y, nganh ma
ky nganh » ky nang, ly ngan, k ngan
va thanh » gia thanh, ban thanh, va tinh
danh dai » danh dau, danh di, danh sai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
va tham » van tham, va cham, va thuat
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nganh xay hoi. hieu ((va tham) or (va thanh)) thuc va danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nganh xay hoi. hieu ((va tham) OR (va thanh)) thuc va danh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nganh xay hoi. hieu ((va tham) or (va thanh)) thuc va danh dai cua tre*.