Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban doanh » van doanh, san doanh, ban danh
doanh di » danh di, doanh dich, doanh tai
cham cuc » cham cuu, pham cuc, pham chuc
thu sach » tu sach, thuat sach, thuoc sach
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, kho tang
cuc ban » cua ban, cac ban, cuu ban
ky lang » ky nang, ky dang, tay lang
cua tre » cua te, cuu tre, dua tren
ve cham » va cham, ve chat, vu cham

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 di ((cua tre) OR (cua triet))~.
• 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 di ((cua tre) OR (cua triet)).
• 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 di ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky lang) or (ky tang)) xa hoi. hieu ve cham cuc ban doanh di ((cua tre) OR (cua triet))*.