Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cac dung » cach dung, cac duong, tac dung
dung dat » dung va, dung tai
so dang » su dang, so dan, so dung
dang ky » dang y, dan ky, dong ky
nang ma » tang ma, sang ma, mang may
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
xuc cac » xuc tac, tuc cac, xuc cam
dat cua » dai cua, day cua, mat cua
cua su » qua su

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 ma) or (nang cao)) hoi. hieu van cac xuc cac dung dat cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so dang ky ((nang ma) OR (nang cao)) hoi. hieu van cac xuc cac dung dat cua su.
• Adding a wildcard symbol may retrieve word variants: so dang ky ((nang ma) or (nang cao)) hoi. hieu van cac xuc cac dung dat cua su*.