Perhaps you should try some spelling variations:
thanh tra » thanh toan, thanh hoa
hieu cao » chieu cao, hieu cac, hieu ca
tra cua » trau cua, trua cua, tra cuu
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
huu va » tuu va
cuu va » cuu van, cuu ve

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 cao chat ((huu va) OR (cuu va)) thanh tra 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 cao chat ((huu va) OR (cuu va)) thanh tra 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 cao chat ((huu va) OR (cuu va)) thanh tra cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (nang x)) hoi. hieu cao chat ((huu va) OR (cuu va)) thanh tra cua tre*.