Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh, ban hang
thien van » thi van
thuc ban » thuoc ban, thuc dan, thu ban
nam thuc » nam thuoc, am thuc, nam thu
thanh ca » thanh cha, thanh cac, thanh ha
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, dua tren
so sach » so sanh, bo sach, co sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty ((nang xa) or (lang xa)) hoi. thien van nam thuc ban thanh ca ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((nang xa) OR (lang xa)) hoi. thien van nam thuc ban thanh ca ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty ((nang xa) or (lang xa)) hoi. thien van nam thuc ban thanh ca ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: so sach ty ((nang xa) or (lang xa)) hoi. thien van nam thuc ban thanh ca ((cua tre) OR (cua triet))*.