Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
va hanh » van hanh, va thanh, va danh
su hoa » su hoan, su hoat, su khoa
va dau » va dao

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 ky dang su hoa. thien van nam thuc ((va hanh) or (va dau)) tai ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang su hoa. thien van nam thuc ((va hanh) OR (va dau)) tai ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang su hoa. thien van nam thuc ((va hanh) or (va dau)) tai ((cua triet) or (va triet))*.