Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh tai, hanh van
sach dao » lanh dao
thuoc ma » hoc ma, duoc ma
sach tai » sach bai, sach tham, sach xa
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ve nam » he nam, va nam, le nam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach tai) OR (sach dao)) lang xa hoi. hieu ve nam thuoc ma ((hanh vai) OR (hanh va)) cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach tai) OR (sach dao)) lang xa hoi. hieu ve nam thuoc ma ((hanh vai) or (hanh va)) cua viet~".
• Adding a wildcard symbol may retrieve word variants: vu ((sach tai) OR (sach dao)) lang xa hoi. hieu ve nam thuoc ma ((hanh vai) or (hanh va)) cua viet*.