Perhaps you should try some spelling variations:
doanh tri » doanh tai, doanh tren, dinh tri
thu sach » tu sach, thuat sach, thuoc sach
va doanh » van doanh, vay doanh, va danh
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
qua cao » qua cac, qua ca, qua cai
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty ((mang may) or (lang xa)) hoi. hieu qua cao duc va doanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((mang may) OR (lang xa)) hoi. hieu qua cao duc va doanh tri cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((mang may) or (lang xa)) hoi. hieu qua cao duc va doanh tri cua tre*.