Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
cua viet » ca viet, hoa viet, cua vat
cam thuc » am thuc, cam thu, can thuc
nam thuc » nam thuoc, am thuc, nam thu
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
sach va » sach xa, sach ha, sach dao
hieu ve » hieu va, hieu van
nang co » nang cao, nang doc, nang noi
va nang » van nang, da nang, cam nang
co hoi » co hoc, co loi
di cua » dai cua, doi cua, de cua

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 va nang co hoi. hieu ve ((cam thuc) or (((nam thuc) or (nha thuoc)))) va hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach va nang co hoi. hieu ve ((cam thuc) OR (((nam thuc) OR (nha thuoc)))) va hanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach va nang co hoi. hieu ve ((cam thuc) or (((nam thuc) or (nha thuoc)))) va hanh di cua viet*.