Perhaps you should try some spelling variations:
doanh qua » doanh quan, doanh cua, danh qua
van doanh » toan doanh, van dong, van thanh
vien cac » vien bach, vien dai, vien da
tu sach » thu sach, su sach, te sach
qua cua » quan cua, quang cua, qua quan
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet
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

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) or (vien cac)) xuc van doanh qua 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) OR (vien cac)) xuc van doanh qua cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ma) or (tang ma)) hoi. hieu ((ve cac) or (vien cac)) xuc van doanh qua cua tre*.