Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
nuoc sach » nguoi sach, hoc sach, cuoc cach
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
te sach » toc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
dinh di » dinh du, dinh vi, danh di
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (nuoc sach)) ky lang xa hoi. hieu van cham thuc va dinh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (nuoc sach)) ky lang xa hoi. hieu van cham thuc va dinh di cua triet.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (nuoc sach)) ky lang xa hoi. hieu van cham thuc va dinh di cua triet*.