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
cau xuc » cam xuc, cau luc, cau truc
nang xa » lang xa, nang ma, mang xa
van cau » van dau, van hau, van chat
hai ky » thai ky, hoi ky, hai ly
su hai » su 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 hai ky ((nang xa) or (nang x)) hoi. hieu van cau xuc ((va hanh) or (va danh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su hai ky ((nang xa) OR (nang x)) hoi. hieu van cau xuc ((va hanh) OR (va danh)) hai cua tre.
• Adding a wildcard symbol may retrieve word variants: su hai ky ((nang xa) or (nang x)) hoi. hieu van cau xuc ((va hanh) or (va danh)) hai cua tre*.