Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cuu tre » cau tren, cau treo
luc van » luoc van, luu van, duc van
cua tre » cua te, cua triet, dua tren
hanh de » hanh ve, hanh kem
lang xa » lang ha, dang xay, lang van
hieu ke » hieu kem, chieu ke, hieu ky
cau luc » cau truc, cau phuc
lai ky » dai ky
sai ky » sac ky
ke cau » ket cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((lai ky) or (sai ky)) lang xa hoi. hieu ke cau luc van hanh de ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((lai ky) OR (sai ky)) lang xa hoi. hieu ke cau luc van hanh de ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: te ((lai ky) or (sai ky)) lang xa hoi. hieu ke cau luc van hanh de ((cua tre) or (cuu tre))*.