Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
dau triet » cau triet, dau tien, su triet
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
nam duoc » da duoc, dat duoc, nam moc
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
nam duc » pham duc, nam thuc, nam buoc
hanh va » hang va, hanh vi
va dau » va dao
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ha hoi » hoa hoi, ha noi, xa hoi

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 lang ha hoi. hieu van ((((nam duc) or (nam thuoc))) or (nam duoc)) van hanh va dau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky lang ha hoi. hieu van ((((nam duc) OR (nam thuoc))) OR (nam duoc)) van hanh va dau triet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang ha hoi. hieu van ((((nam duc) or (nam thuoc))) or (nam duoc)) van hanh va dau triet*.