Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
pham thuc » phap thuc, pham chuc, nham thuc
doc sach » hoc sach, toc sach, nuoc sach
va trien » va truyen, va thiet, va tuyen
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
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: doc sach ky sang ma hoi. hieu ve pham thuc ((va danh) or (va hanh)) lai ((cua triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ky sang ma hoi. hieu ve pham thuc ((va danh) OR (va hanh)) lai ((cua triet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: doc sach ky sang ma hoi. hieu ve pham thuc ((va danh) or (va hanh)) lai ((cua triet) or (va trien))*.