Perhaps you should try some spelling variations:
luan phan » luan van, luan hoan
hieu luan » hieu luat, hieu quan, tieu luan
su triet » su viet, su tien, ve triet
phan duc » pham duc, phan tu, phan dau
dang xay » dang van, van xay
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
mang xa » lang xa, mang may, mang cua
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao

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

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