Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
hanh cua » manh cua, hang cua, doanh cua
hanh sua » hinh su, hanh va, hanh tu
su triet » su viet, su tien, ve triet
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cam hoc » cao hoc, am hoc, cam hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky lang xa hoi. ((hieu van) or (thien van)) cam hoc va ((hanh cua) OR (hanh sua)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky lang xa hoi. ((hieu van) OR (thien van)) cam hoc va ((hanh cua) OR (hanh sua)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky lang xa hoi. ((hieu van) or (thien van)) cam hoc va ((hanh cua) OR (hanh sua)) su triet".
• Adding a wildcard symbol may retrieve word variants: so sach ky lang xa hoi. ((hieu van) or (thien van)) cam hoc va ((hanh cua) OR (hanh sua)) su triet*.