Perhaps you should try some spelling variations:
bach tuoc » sach duoc, sach nuoc
hien bach » vien bach, thien hach, hien hanh
hieu hien » bieu hien, dieu hien, chieu chien
cua viet » ca viet, hoa viet, cua vat
tai khoa » da khoa, noi khoa
lai hoi » dai hoi, lai hoa, lai roi
cach tu » cach thuc
mai hoi » mai khoi, dai hoi, mai doi
tu nang » tru nang, tu nong, tu nano
tuoc va » thuoc va, nuoc va, duoc va
va hanh » van hanh, va thanh, va danh
tu cach » tu cac
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 cach tu nang ((((mai hoi) or (lai hoi))) or (tai khoa)). hieu hien bach tuoc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach tu nang ((((mai hoi) OR (lai hoi))) OR (tai khoa)). hieu hien bach tuoc va hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: tu cach tu nang ((((mai hoi) or (lai hoi))) or (tai khoa)). hieu hien bach tuoc va hanh vi cua viet*.