Perhaps you should try some spelling variations:
doanh cao » doanh bao, doanh cho, doanh dao
thu sach » tu sach, thuat sach, thuoc sach
doanh ca » doanh cua, doanh va, danh ca
doanh co » doanh cua, doanh va, anh co
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
cam lo » nam lo, cam ly, cam o
y nang » ky nang, ly nang, v nang
lo va » lo van, lao va, ly va
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu va cam lo va ((doanh ca) OR (((doanh cao) OR (doanh co)))) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. hieu va cam lo va ((doanh ca) or (((doanh cao) OR (doanh co)))) cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu va cam lo va ((doanh ca) or (((doanh cao) OR (doanh co)))) cua tre*.