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

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

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