Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
van cham » van chat, van tham, van pham
ban hanh » ban hang
duc ban » duc tan, duc van, dua ban
ky dang » ky danh
hanh va » hang va, hanh vi
va cham » va chat, va tham
va cua » va chua, via cua, ca cua
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 xac ((ky dang) or (ky nang)) ha noi. hieu ((van cham) OR (va cham)) duc ban hanh va cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ((ky dang) OR (ky nang)) ha noi. hieu ((van cham) OR (va cham)) duc ban hanh va cua thuoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ((ky dang) or (ky nang)) ha noi. hieu ((van cham) OR (va cham)) duc ban hanh va cua thuoc".
• Adding a wildcard symbol may retrieve word variants: su xac ((ky dang) or (ky nang)) ha noi. hieu ((van cham) OR (va cham)) duc ban hanh va cua thuoc*.