Perhaps you should try some spelling variations:
thuoc ban » thuoc tan, thuoc dang, thu ban
thuc ban » thuc dan, thu ban, thuc van
hanh lai » hanh lam, hanh tai, thanh lap
cua viet » ca viet, hoa viet, cua vat
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
tai hai » thi hai, dai hai, tai ha
tai hoi » tai khoi, dai hoi, tai hoe
lai cua » dai cua, hai cua, lai chau
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ((tai hoi) OR (tai hai)). hieu va tham ((thuc ban) or (thuoc ban)) hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((tai hoi) OR (tai hai)). hieu va tham ((thuc ban) OR (thuoc ban)) hanh lai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((tai hoi) OR (tai hai)). hieu va tham ((thuc ban) or (thuoc ban)) hanh lai cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((tai hoi) OR (tai hai)). hieu va tham ((thuc ban) or (thuoc ban)) hanh lai cua viet*.