Perhaps you should try some spelling variations:
va trien » va truyen, va tuyen, va tieng
cau luc » cau truc, cau phuc
hanh de » hanh ve, hanh kem
luc van » luoc van, luu van, duc van
hieu ke » hieu kem, chieu ke, hieu ky
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
ke cau » ket cau
sac ky » cac ky, sai ky
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky lang ha noi. hieu ke cau luc van ((hanh de) or (hanh vi)) ((va thiet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang ha noi. hieu ke cau luc van ((hanh de) OR (hanh vi)) ((va thiet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: te sac ky lang ha noi. hieu ke cau luc van ((hanh de) or (hanh vi)) ((va thiet) or (va trien))*.