Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
cho hoc » co hoc, khoa hoc
cao hoc » co hoc, chat hoc
lang ha » long ha
hieu va » lieu va, hieu qua
ky lang » ky nang, ky dang, ky tang
xac ky » cac ky, sac ky, bac ky
ha hoi » hoa hoi, ha noi, xa hoi
tai va » thai va, mai va, tri va
su xac » pu xac, su cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky lang ha hoi. hieu va ((cao hoc) OR (cho hoc)) van hanh tai va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky lang ha hoi. hieu va ((cao hoc) OR (cho hoc)) van hanh tai va triet".
• Adding a wildcard symbol may retrieve word variants: su xac ky lang ha hoi. hieu va ((cao hoc) OR (cho hoc)) van hanh tai va triet*.