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