Perhaps you should try some spelling variations:
thuoc vat » thuc vat, thuoc va, thuoc bat
nam thuoc » nam thuc, nam thu, nha thuoc
dai viet » mai viet, dao viet, tai viet
vat hanh » vat thanh, van hanh, va hanh
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
su sach » so sach
ky sang » ky nang, ky dang, ky tang
vu sach » vu bach, vu khach
ma hoi » mai hoi, xa hoi, me hoi
ve nam » he nam, va nam, le nam
va dai » va dao, vi dai, va dau

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) or (vu sach)) ky sang ((ma hoi) or (ma hoa)). hieu ve nam thuoc vat hanh va dai viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky sang ((ma hoi) OR (ma hoa)). hieu ve nam thuoc vat hanh va dai viet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky sang ((ma hoi) or (ma hoa)). hieu ve nam thuoc vat hanh va dai viet*.