Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
nam duoc » nam thuoc, da duoc, dat duoc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, lam duoc
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo

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 xa hoi. hieu ve ((((cam duc) or (nam duoc))) or (pham duc)) ban doanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ve ((((cam duc) OR (nam duoc))) OR (pham duc)) ban doanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ve ((((cam duc) or (nam duoc))) or (pham duc)) ban doanh tai cuu tre*.