Perhaps you should try some spelling variations:
luan phan » luan van, luan hoan
hieu luan » hieu luat, hieu quan, tieu luan
phan dau » phan tu, hang dau
van hanh » van thanh, ban hanh, van anh
ve triet » va trien, su 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
dau van » dao van, dam van, dau va
vi ve » va ve, gi ve, ve ve

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 dau van hanh vi ve 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 dau van hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((mang xa) or (sang ma)) hoi. hieu luan phan dau van hanh vi ve triet*.