Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu ke » hieu kem, chieu ke, hieu ky
cau luc » cau truc, cau phuc
luc van » luoc van, luu van, duc van
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ke cau » ket cau
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu ke cau luc van hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang x hoi. hieu ke cau luc van hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: te sac ky nang x hoi. hieu ke cau luc van hanh vi ((cua tre) or (cuu tre))*.