Perhaps you should try some spelling variations:
giai thanh » gia thanh, gian thanh, giay thanh
thuc giai » thuoc giao, hoc giai, thuc thai
va triet » va thiet, va trien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
cac thuc » cach thuc, cac thu, can thuc
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
nang xa » lang xa, nang ma, mang xa
cuu tre » cua tre, cau tren, cau treo
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 (nang x)) hoi. hieu va cac thuc giai thanh vi ((cuu tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((nang xa) OR (nang x)) hoi. hieu va cac thuc giai thanh vi ((cuu tre) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty ((nang xa) OR (nang x)) hoi. hieu va cac thuc giai thanh vi ((cuu tre) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: so sach ty ((nang xa) OR (nang x)) hoi. hieu va cac thuc giai thanh vi ((cuu tre) or (va triet))*.