Perhaps you should try some spelling variations:
hanh xuan » thanh xuan, anh xuan, lanh xuan
hien hanh » dieu hanh
dieu hien » dieu khien, dieu kien, bieu hien
cua viet » ca viet, hoa viet, cua vat
mai khoi » mai khoa, tai khoa, cac khoi
lai hoi » dai hoi, lai hoa, lai roi
sach tu » sach thu, cach tu, sach ty
mai hoi » dai hoi, mai doi, mai hoa
tu nang » tru nang, tu nong, tu nano
xuan va » xuat va, luan va, quan va
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te 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: tu sach tu nang ((((mai hoi) or (lai hoi))) or (mai khoi)). dieu hien hanh xuan va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang ((((mai hoi) OR (lai hoi))) OR (mai khoi)). dieu hien hanh xuan va hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang ((((mai hoi) or (lai hoi))) or (mai khoi)). dieu hien hanh xuan va hanh vi cua viet*.