Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
hanh de » hanh ve, hanh kem
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ve cac » va cac, vien cac
sac ky » cac ky

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

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