Perhaps you should try some spelling variations:
luat phan » luat phap, luat pha, xuat phan
luan phan » luan van, luan hoan
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
mang xa » lang xa, mang may, dang xay
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((mang xa) or (nang ma)) hoi. hieu ((luat phan) OR (luan phan)) duc va hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((mang xa) OR (nang ma)) hoi. hieu ((luat phan) OR (luan phan)) duc va hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((mang xa) or (nang ma)) hoi. hieu ((luat phan) OR (luan phan)) duc va hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((mang xa) or (nang ma)) hoi. hieu ((luat phan) OR (luan phan)) duc va hanh vi su triet*.