Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van chat » cao chat
chat xuc » chat huu, cam xuc, chao xu
van hanh » ban hanh, van anh, van ban
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, te sach, tu cach
cao hoi » cau hoi, co hoi, cao hoc
su sach » so sach, vu sach
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) OR (su sach)) ky nang cao hoi. hieu van chat xuc ((van hanh) or (van thanh)) vi so viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang cao hoi. hieu van chat xuc ((van hanh) OR (van thanh)) vi so viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang cao hoi. hieu van chat xuc ((van hanh) or (van thanh)) vi so viet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang cao hoi. hieu van chat xuc ((van hanh) or (van thanh)) vi so viet*.