Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so dang » su dang, so dan, so dung
dang ky » dang y, dan ky, dong ky
cao hoi » cau hoi, co hoi, cao hoc
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
xuc cac » xuc tac, tuc cac, xuc cam
va cua » va chua, via cua, ma cua
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so dang ky nang cao hoi. hieu van cac xuc cac dan ((va cua) or (ca cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so dang ky nang cao hoi. hieu van cac xuc cac dan ((va cua) OR (ca cua)) tu.
• Adding a wildcard symbol may retrieve word variants: so dang ky nang cao hoi. hieu van cac xuc cac dan ((va cua) or (ca cua)) tu*.