Perhaps you should try some spelling variations:
doanh cao » doanh co, doanh bao, doanh cho
thu sach » tu sach, thuat sach, thuoc sach
doanh ca » doanh cua, doanh va, danh ca
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
cam lo » cam ly, cam o
nam lo » nam bo, nam so, nam co
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) OR (nam lo)) va ((doanh ca) OR (doanh cao)) 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) OR (nam lo)) va ((doanh ca) or (doanh cao)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu va ((cam lo) OR (nam lo)) va ((doanh ca) or (doanh cao)) cua tre*.