Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
sach tuc » sach truc, sach tu, cach thuc
tuc tang » thuc trang, duc thang, duc tan
nam thuc » am thuc, nam thu, nam tu
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
ma hoi » mai hoi, xa hoi, ma hoa
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: so sach tuc tang ma hoi. hieu ve ((nam thuc) or (nam thuoc)) va hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tuc tang ma hoi. hieu ve ((nam thuc) OR (nam thuoc)) va hanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: so sach tuc tang ma hoi. hieu ve ((nam thuc) or (nam thuoc)) va hanh di cua viet*.