Perhaps you should try some spelling variations:
chat triet » chet triet, phat trien, chat thien
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
van bac » van ban, van bao, van hac
xuc van » duc van, luc van, vuc van
hanh va » hang va, hanh vi
va chat » van chat, va phat, cao chat

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: tu sach ky ((nang x) OR (nang ma)) hoi. hieu van bac xuc van hanh va chat triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang x) or (nang ma)) hoi. hieu van bac xuc van hanh va chat triet*.