Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
pham thuc » phap thuc, pham chuc, nham thuc
doc sach » hoc sach, toc sach, nuoc sach
danh lai » danh sai, gianh lai, dinh lam
va triet » va thiet, va trien, ve triet
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
ky sang » ky nang, ky dang, ky tang
ve pham » vi pham, v pham, ve phan
ma hoi » mai hoi, xa hoi, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky sang ((ma hoi) OR (ma hoa)). hieu ve pham thuc va danh lai ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky sang ((ma hoi) OR (ma hoa)). hieu ve pham thuc va danh lai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky sang ((ma hoi) OR (ma hoa)). hieu ve pham thuc va danh lai ((cua triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: doc sach ky sang ((ma hoi) OR (ma hoa)). hieu ve pham thuc va danh lai ((cua triet) or (va triet))*.