Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
toc sach » hoc sach, doc sach, thuoc sach
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
vi va » vi van, vai va, vu va

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

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