Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
cua viet » ca viet, hoa viet, cua dieu
thuoc va » thuc va, thuoc ma, thuong va
so sach » so sanh, bo sach, co sach
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
ty tang » tay tang, ty xang, ty hang
ve nam » he nam, va nam, le nam
ma hoi » mai hoi, ma hoa, me hoi

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 ty tang ((ma hoi) or (xa hoi)). hieu ve nam thuoc va danh vi ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty tang ((ma hoi) OR (xa hoi)). hieu ve nam thuoc va danh vi ((cua viet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: so sach ty tang ((ma hoi) or (xa hoi)). hieu ve nam thuoc va danh vi ((cua viet) or (cua vat))*.