Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua quoc
cua nuoc » cua quoc, cua nguoi, nha nuoc
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
ban hanh » ban hang
cham duc » pham duc, cham soc, pham duy
van cham » van chat, van tham, va cham
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
duc ban » duc tan, duc van, dua ban
su xac » pu xac, su cac
su sac » su sach, su cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sac) or (su xac)) ky lang ha noi. hieu van cham duc ban hanh tai ((cua thuoc) OR (cua nuoc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su xac)) ky lang ha noi. hieu van cham duc ban hanh tai ((cua thuoc) OR (cua nuoc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su xac)) ky lang ha noi. hieu van cham duc ban hanh tai ((cua thuoc) OR (cua nuoc))".
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su xac)) ky lang ha noi. hieu van cham duc ban hanh tai ((cua thuoc) OR (cua nuoc))*.