Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
tu sach » thu sach, su sach, te sach
cua cua » cua chua, ca cua, qua cua
xuc vay » xuc hay
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
ve cac » va cac, vien cac
co cua » con cua, ca cua, cong 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 ma) or (tang ma)) hoi. hieu ve cac xuc vay doanh ((cua cua) or (co cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (tang ma)) hoi. hieu ve cac xuc vay doanh ((cua cua) OR (co cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ma) or (tang ma)) hoi. hieu ve cac xuc vay doanh ((cua cua) or (co cua)) tre*.