Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
cua triet » cua viet, su triet, va triet
thuc gia » thuc giai, thue gia, thuc dia
thanh vi » hanh vi, thanh va, thanh ve
so sach » so sanh, bo sach, co sach
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
va cach » va cac
cua tre » cua te, cuu tre, dua tren

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