Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
lai hoi » dai hoi, lai hoa, lai roi
cac xuc » cac nuoc, chat xuc, cac cuoc
ty nang » ty xang, ty hang, ly nang
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ty nang) OR (ky nang)) lai hoi. hieu hien ((cac xuc) or (cam xuc)) van hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ky nang)) lai hoi. hieu hien ((cac xuc) OR (cam xuc)) van hanh di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty nang) OR (ky nang)) lai hoi. hieu hien ((cac xuc) or (cam xuc)) van hanh di cua viet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) OR (ky nang)) lai hoi. hieu hien ((cac xuc) or (cam xuc)) van hanh di cua viet*.