Perhaps you should try some spelling variations:
thanh tri » thanh tra, thanh tai, chinh tri
tu sach » thu sach, su sach, te sach
truc va » thuc va, thuc vat, trung va
sach ty » sach y, sach tu, sach thu
va chat » van chat, va phat, cao chat
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, tuc xa, 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: tu sach ty ((nang xa) or (nang x)) hoi. hieu va chat ((tuc va) OR (truc va)) thanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (nang x)) hoi. hieu va chat ((tuc va) OR (truc va)) thanh tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (nang x)) hoi. hieu va chat ((tuc va) OR (truc va)) thanh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (nang x)) hoi. hieu va chat ((tuc va) OR (truc va)) thanh tri cua tre*.