Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh sua » hinh su, hanh va, hanh tu
hanh cua » manh cua, hang cua, doanh cua
cac hoc » cach hoc, cac hop, bac hoc
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
cac loc » cac lop, cac toc, cac nuoc
hieu ve » hieu va, hieu van
ang xa » lang xa, mang xa, dang xay
ty ang » ty xang, ty hang, ty anh

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