Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
duc ban » duc tan, duc van, dua ban
nang xa » nang x, nang ma, mang xa
hanh va » hang va, hanh vi
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
luc ban » cuc ban, luc bat, luc van
va cua » va chua, via cua, ca cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (lang xa)) hoi. hieu va cam ((luc ban) OR (duc ban)) hanh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) OR (lang xa)) hoi. hieu va cam ((luc ban) or (duc ban)) hanh va cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) OR (lang xa)) hoi. hieu va cam ((luc ban) or (duc ban)) hanh va cua tre*.