Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
manh cua » doanh cua, ban cua
hanh cua » hang cua, hanh sua, doanh cua
hieu van » hieu va, thien van, lieu va
cac loc » cac lop, cac toc, cac hoc
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va
xang xa » lang xa, mang xa, ang xa
loc va » hoc va, luc va

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 ty xang xa hoi. ((hieu ve) or (hieu van)) cac loc va ((hanh cua) OR (manh cua)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty xang xa hoi. ((hieu ve) OR (hieu van)) cac loc va ((hanh cua) OR (manh cua)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty xang xa hoi. ((hieu ve) or (hieu van)) cac loc va ((hanh cua) OR (manh cua)) cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach ty xang xa hoi. ((hieu ve) or (hieu van)) cac loc va ((hanh cua) OR (manh cua)) cua triet*.