Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
ban hanh » ban hang
chat xuc » chat huu, cam xuc, chao xu
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. hieu va chat xuc ((va hanh) or (ban hanh)) vai ((cua tre) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu va chat xuc ((va hanh) OR (ban hanh)) vai ((cua tre) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu va chat xuc ((va hanh) or (ban hanh)) vai ((cua tre) or (va trien))*.