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

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang xa) or (nang ma)) hoi. hieu va cac ((luc ban) or (duc ban)) hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (nang ma)) hoi. hieu va cac ((luc ban) OR (duc ban)) hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (nang ma)) hoi. hieu va cac ((luc ban) or (duc ban)) hanh va cua tre*.