Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
thanh lam » hanh lam, thanh nam, thanh tam
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
cac duc » cac du, cao duc, cac dac
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
so sanh » do sanh
van cac » van hac, van cau, van bac

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

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