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
ly vang » ly hang, ly van, ly quang
ve cham » va cham, ve chat, vu cham
ly nang » ky nang, ly hang, ly quang
thuc va » thuc vat, thuc dan, thuc day
dinh vi » dinh ve, dinh viet, dinh tri
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa

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 ((ly nang) OR (ly vang)) ma hoi. hieu ve cham thuc va ((dinh vi) or (chinh tri)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ly nang) OR (ly vang)) ma hoi. hieu ve cham thuc va ((dinh vi) OR (chinh tri)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ly nang) OR (ly vang)) ma hoi. hieu ve cham thuc va ((dinh vi) or (chinh tri)) va triet".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ly nang) OR (ly vang)) ma hoi. hieu ve cham thuc va ((dinh vi) or (chinh tri)) va triet*.