Perhaps you should try some spelling variations:
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
xac ky » cac ky, bac ky
sac ky » cac ky
cac lo » cac lop, cac co, cac bo
va cua » va chua, via cua, ca cua
lo va » lo van, lao va, ly va

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

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