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
va dinh » van dinh, va kinh, va tinh
via cua » gia cua, gian cua, giau cua
cua tre » cua te, cuu tre, cua triet
su cac » tu cac, su can, eu cac
su cao » cu cao, vu cao, su co
bai bo » bac bo, ban bo, bai mo

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

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