Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
thien van » thi van
hanh hai » thanh hai, nhanh hai, hang hai
ban hanh » ban hang
cham duc » pham duc, cham soc, pham duy
hieu van » hieu va, lieu va, hieu ve
hai cua » thai cua, dai cua, hoi cua
duc ban » duc tan, duc van, dua ban
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
su sach » so sach, vu sach
su sac » su cac, su xac

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