Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
cac xuc » cam xuc, chat xuc, cac cuoc
cua tre » cua te, cuu tre, cua triet
tu ban » thu ban, te ban
ban ky » van ky, dan ky
va xay » va xac
va don » va dong, va doc, va do
vi cua » vai cua, di cua
ky va » ly va, ke va, my va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ban ky va xay hoi. hieu va ((cac xuc) or (cac nuoc)) va don vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ban ky va xay hoi. hieu va ((cac xuc) OR (cac nuoc)) va don vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ban ky va xay hoi. hieu va ((cac xuc) or (cac nuoc)) va don vi cua tre*.