Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
cua viet » ca viet, hoa viet, cua vat
nam thuc » am thuc, nam thu, nam tu
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
hieu ve » hieu va
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
lai cua » dai cua, hai cua, lai chau
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
su sac » su sach, 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 ky sang ma hoi. ((hieu ve) OR (hieu van)) ((nam thuc) or (nam thuoc)) van hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky sang ma hoi. ((hieu ve) OR (hieu van)) ((nam thuc) OR (nam thuoc)) van hanh lai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky sang ma hoi. ((hieu ve) OR (hieu van)) ((nam thuc) or (nam thuoc)) van hanh lai cua viet".
• Adding a wildcard symbol may retrieve word variants: su sac ky sang ma hoi. ((hieu ve) OR (hieu van)) ((nam thuc) or (nam thuoc)) van hanh lai cua viet*.