Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
hanh dai » hanh tai, hanh dao, vanh dai
ban hanh » ban hang
cham duc » pham duc, pham duy, phan duc
hieu van » hieu va, thien van, lieu va
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
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 dang ha noi. hieu van ((cham duc) or (cham soc)) 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) OR (cham soc)) 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) or (cham soc)) ban hanh dai cua thuoc*.