Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
cua viet » ca viet, hoa viet, cua vat
van hanh » van thanh, ban hanh, van anh
dai hoi » dai hoc, dai hai, dai moi
sach ty » sach y, sach tu, sach thu
lai hoi » lai hoa, lai roi, mai hoi
ty nang » ky nang, ty xang, ty hang
te sach » toc sach
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: te sach ty nang ((lai hoi) or (dai hoi)). hieu hien ((hoc nuoc) or (cam xuc)) van hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((lai hoi) OR (dai hoi)). hieu hien ((hoc nuoc) OR (cam xuc)) van hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((lai hoi) or (dai hoi)). hieu hien ((hoc nuoc) or (cam xuc)) van hanh vi cua viet*.