Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
van chat » cao chat
chat xuc » chat huu, cam xuc, chao xu
van hanh » ban hanh, van anh, van minh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
so viet » hoc viet
vi so » vi soi, vi mo, va so

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