Perhaps you should try some spelling variations:
thuoc ban » thuoc tan, thuoc dang, thu ban
nha thuoc » nha nuoc, nhan thuc, nha hoc
ban hanh » ban hang
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
may hoi » may thoi, tay hoi, may hmi
sac ky » cac ky, sai ky
va nha » va nho, ve nha
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 ((may hoi) OR (mai hoi)). hieu va nha thuoc ban hanh ((lai chau) or (dai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((may hoi) OR (mai hoi)). hieu va nha thuoc ban hanh ((lai chau) OR (dai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((may hoi) OR (mai hoi)). hieu va nha thuoc ban hanh ((lai chau) or (dai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((may hoi) OR (mai hoi)). hieu va nha thuoc ban hanh ((lai chau) or (dai cua)) triet*.