Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
cho duoc » che duoc, co duoc, cho cuoc
ve triet » su triet
hanh lam » thanh lap, hanh kem, hanh va
van hanh » van thanh, ban hanh, van anh
duoc van » duoc va, duc van, duoc ban
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
xang xa » lang xa, mang xa, dang xay
ang xa » lang xa, mang xa, dang xay
va cho » van cho, va co, va che

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach tu ((xang xa) OR (ang xa)) hoi. hieu va cho duoc van hanh lam ((ve triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu ((xang xa) OR (ang xa)) hoi. hieu va cho duoc van hanh lam ((ve triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu ((xang xa) OR (ang xa)) hoi. hieu va cho duoc van hanh lam ((ve triet) or (va trien))".
• Adding a wildcard symbol may retrieve word variants: su sach tu ((xang xa) OR (ang xa)) hoi. hieu va cho duoc van hanh lam ((ve triet) or (va trien))*.