Perhaps you should try some spelling variations:
hien hanh » dieu hanh
hieu hien » bieu hien, dieu hien, chieu chien
cua viet » ca viet, hoa viet, cua vat
van hanh » van thanh, ban hanh, van anh
hanh xuc » hanh xu, hanh phuc, hanh duoc
mai khoa » tai khoa, may khoa, dai khoa
lai hoi » dai hoi, lai hoa, lai roi
cach tu » cach thuc
mai hoi » mai khoi, dai hoi, mai doi
xuc van » duc van, luc van, vuc van
tu nang » tru nang, tu nong, tu nano
hanh di » hanh vi, hanh de, hang di
so cach » so sach, co cach, loi cach
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: so cach tu nang ((((mai hoi) or (lai hoi))) or (mai khoa)). hieu hien hanh xuc van hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so cach tu nang ((((mai hoi) OR (lai hoi))) OR (mai khoa)). hieu hien hanh xuc van hanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: so cach tu nang ((((mai hoi) or (lai hoi))) or (mai khoa)). hieu hien hanh xuc van hanh di cua viet*.