Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
doanh ca » doanh cua, doanh cao, doanh va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
ve cau » ke cau, va cau, ve cac
luc va » duc va, tuc va, loc va
ca cua » co cua

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

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