Perhaps you should try some spelling variations:
hieu luan » hieu luat, hieu quan, tieu luan
luan phan » luan van, luan hoan
phan duc » pham duc, phan tu, phan dau
van hanh » van thanh, ban hanh, van anh
sach tu » sach thu, cach tu, sach uu
sach ty » sach y, sach thu, xach tay
duc van » duc va, duc tan, duc manh
su viet » so viet
ang xa » lang xa, mang xa, dang xay
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: tu ((sach tu) OR (sach ty)) ang xa hoi. hieu luan phan duc van hanh vi su viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) OR (sach ty)) ang xa hoi. hieu luan phan duc van hanh vi su viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) OR (sach ty)) ang xa hoi. hieu luan phan duc van hanh vi su viet*.