Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
cua tre » cua te, cuu tre, cua triet
dan cua » dan ca, ban cua, dai cua
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
sac ky » cac ky, sai ky
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
su sac » su sach, su cac, su xac

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

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