Perhaps you should try some spelling variations:
san doanh » van doanh, toan doanh, vay doanh
ban doanh » van doanh, ban danh, toan doanh
thu sach » tu sach, thuat sach, thuoc sach
cham cuc » cham cuu, pham cuc, pham chuc
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ky lang) or (ky tang)) xa hoi. hieu ve cham cuc ((ban doanh) OR (san doanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky lang) OR (ky tang)) xa hoi. hieu ve cham cuc ((ban doanh) OR (san doanh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky lang) or (ky tang)) xa hoi. hieu ve cham cuc ((ban doanh) OR (san doanh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky lang) or (ky tang)) xa hoi. hieu ve cham cuc ((ban doanh) OR (san doanh)) di cua tre*.