Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
va triet » va thiet, va trien, ve triet
van hanh » ban hanh, van anh, van ban
chat xuc » chat huu, cam xuc, chao xu
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
va chat » van chat, va phat, cao chat
ma hoi » xa hoi, ma hoa, me hoi
vi va » vi van, vai va, vu va

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) OR (mai hoi)). hieu va chat xuc ((van hanh) or (van thanh)) vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (mai hoi)). hieu va chat xuc ((van hanh) OR (van thanh)) vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) OR (mai hoi)). hieu va chat xuc ((van hanh) or (van thanh)) vi va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) OR (mai hoi)). hieu va chat xuc ((van hanh) or (van thanh)) vi va triet*.