Perhaps you should try some spelling variations:
thanh tri » thanh tra, thanh tai, chinh tri
thu sach » tu sach, thuat sach, thuoc sach
va chat » van chat, va phat, cao chat
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, duc va

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 ((nang xa) or (nang x)) hoi. hieu va chat ((tuc va) OR (tuc xa)) thanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang xa) OR (nang x)) hoi. hieu va chat ((tuc va) OR (tuc xa)) thanh tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((nang xa) or (nang x)) hoi. hieu va chat ((tuc va) OR (tuc xa)) thanh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang xa) or (nang x)) hoi. hieu va chat ((tuc va) OR (tuc xa)) thanh tri cua tre*.