Perhaps you should try some spelling variations:
cuc thuoc » cua thuoc, cuu thuoc, truc thuoc
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
hanh tai » thanh tai, hang tai, han tai
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
duc ban » duc van, dua ban, duc man
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) OR (duc tan)) hanh tai cuc 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) OR (duc tan)) hanh tai cuc thuoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su xac)) ky dang ha noi. hieu van cham ((duc ban) OR (duc tan)) hanh tai cuc thuoc".
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su xac)) ky dang ha noi. hieu van cham ((duc ban) OR (duc tan)) hanh tai cuc thuoc*.