Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham duc » pham duc, cham soc, pham duy
ban hanh » ban hang
hanh dai » hanh tai, hanh dao, vanh dai
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
duc ban » duc tan, duc van, dua ban
su sac » su sach, su cac
su xac » pu xac, 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 dang ha noi. hieu van cham duc ban hanh dai cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su xac)) ky dang ha noi. hieu van cham duc ban hanh dai cua thuoc.
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su xac)) ky dang ha noi. hieu van cham duc ban hanh dai cua thuoc*.