Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh do, thanh dinh
thanh de » hanh de, thanh ve, thanh do
so viet » hoc viet
thu ban » thu hang
hieu ve » hieu va, hieu van
nang co » nang cao, nang doc, nang noi
sac ky » cac ky, sai ky
ve nam » he nam, va nam, le nam
co hoi » co hoc, co loi
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 nang co hoi. hieu ve nam thu ban ((thanh di) OR (thanh de)) ((va thiet) or (so viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang co hoi. hieu ve nam thu ban ((thanh di) OR (thanh de)) ((va thiet) OR (so viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang co hoi. hieu ve nam thu ban ((thanh di) OR (thanh de)) ((va thiet) or (so viet))*".