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