Perhaps you should try some spelling variations:
hanh dien » nhanh dien, hang dien, danh dien
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
chieu ke » hieu ky, hieu ve, hieu kem
sach ky » sach y, sach kem, sach hay
dien su » dien tu, nien su, den su
su tien » su kien, su hien, tu tieng
sach ty » sach y, sach tu, sach thu
nang o » nang co, nang ho, nang ro
ke cau » ket cau
sac ky » cac ky, sai ky
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((((sach ky) or (sac ky))) or (sach ty)) nang o hoi. chieu ke cau truc van hanh dien su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((((sach ky) OR (sac ky))) OR (sach ty)) nang o hoi. chieu ke cau truc van hanh dien su tien.
• Adding a wildcard symbol may retrieve word variants: te ((((sach ky) or (sac ky))) or (sach ty)) nang o hoi. chieu ke cau truc van hanh dien su tien*.