Perhaps you should try some spelling variations:
tu cach » tu cac
via cua » gia cua, gian cua, giau cua
va hanh » van hanh, va thanh, va danh
cach tu » cach thuc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
va dan » ca dan, va dao, va dau
cac co » cac cong

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach tu ((nang xa) or (nang x)) hoi. hieu va cac co ((va hanh) or (va dan)) via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach tu ((nang xa) OR (nang x)) hoi. hieu va cac co ((va hanh) OR (va dan)) via cua tre.
• Adding a wildcard symbol may retrieve word variants: tu cach tu ((nang xa) or (nang x)) hoi. hieu va cac co ((va hanh) or (va dan)) via cua tre*.