Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua triet » cua viet, su triet, va triet
hieu van » thien van, lieu va, hieu ve
chat xuc » chat huu, cam xuc, chao xu
van hanh » ban hanh, van anh, van ban
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua

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