Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
nhan luc » nang luc
van nhan » van phan, van thanh, danh nhan
hai cua » thai cua, dai cua, hoi cua
so sanh » do sanh
sanh ky » hanh ky, sang ky, nganh ky
lang xa » lang ha, dang xay, lang van
mang xa » mang may, dang xay, mang cua
nang xa » nang x, nang ma, ang xa
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh ky ((((nang xa) OR (mang xa))) or (lang xa)) hoi. hieu van nhan luc va thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky ((((nang xa) OR (mang xa))) OR (lang xa)) hoi. hieu van nhan luc va thanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ky ((((nang xa) OR (mang xa))) or (lang xa)) hoi. hieu van nhan luc va thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: so sanh ky ((((nang xa) OR (mang xa))) or (lang xa)) hoi. hieu van nhan luc va thanh hai cua tre*.