Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
hai cua » thai cua, dai cua, hoi cua
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
van bac » van ban, van bao, van hac
nang xa » lang xa, nang ma, mang xa
tai ky » thai ky, trai ky, sai ky
su tai » su thi, tu tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su tai ky ((nang xa) or (nang x)) hoi. hieu van bac xuc ((va hanh) or (va danh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su tai ky ((nang xa) OR (nang x)) hoi. hieu van bac xuc ((va hanh) OR (va danh)) hai cua tre.
• Adding a wildcard symbol may retrieve word variants: su tai ky ((nang xa) or (nang x)) hoi. hieu van bac xuc ((va hanh) or (va danh)) hai cua tre*.