Perhaps you should try some spelling variations:
luan phan » luan van, luan hoan
hieu luan » hieu luat, hieu quan, tieu luan
phan duc » pham duc, phan tu, phan dau
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
mang xa » lang xa, mang may, dang xay
sang ma » tang ma, nang ma, sang tao
duc van » duc va, duc tan, duc manh
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: te sach ky ((mang xa) or (sang ma)) hoi. hieu luan phan duc van hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((mang xa) OR (sang ma)) hoi. hieu luan phan duc van hanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((mang xa) or (sang ma)) hoi. hieu luan phan duc van hanh vi su triet*.