Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
hieu van » hieu va, thien van, lieu va
cham duc » pham duc, pham duy, phan duc
ban hanh » ban hang
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang ha » dong ha, dung ha, lang ha
vai cua » dai cua, hai cua, lai cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky dang ha noi. hieu van ((cham duc) or (cham soc)) ban hanh vai cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang ha noi. hieu van ((cham duc) OR (cham soc)) ban hanh vai cua thuoc.
• Adding a wildcard symbol may retrieve word variants: su sach ky dang ha noi. hieu van ((cham duc) or (cham soc)) ban hanh vai cua thuoc*.