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 dinh » van dinh, va kinh, va tinh
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
nang xa » lang xa, nang ma, mang xa
van cac » van hac, van cau, van bac
dai ky » dan ky, dai ly, sai ky
su dai » sau dai, si dai, 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 dai ky ((nang xa) or (nang x)) hoi. hieu van cac xuc ((va hanh) or (va dinh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su dai ky ((nang xa) OR (nang x)) hoi. hieu van cac xuc ((va hanh) OR (va dinh)) hai cua tre.
• Adding a wildcard symbol may retrieve word variants: su dai ky ((nang xa) or (nang x)) hoi. hieu van cac xuc ((va hanh) or (va dinh)) hai cua tre*.