Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh lai » thanh hai, thanh lap, thanh loi
va thanh » gia thanh, ban thanh, va tinh
cuu thuc » cuu tac
hieu van » hieu va, thien van, lieu va
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
van cuu » van cau, van chu, van cu
thuc va » thuc vat, thuc dan, thuc day
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, dua tren
tu sach » thu sach, su sach, te sach

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

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