Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van thanh » ban thanh, van tuan
thanh de » hanh de, thanh ve, thanh do
cac luat » cap luat, cac xuat, cac thuat
hieu va » lieu va, hieu qua
sach ly » sach lo, sach ty, sach hay
nang mo » nang meo, nang ma, nang co
cac luu » sach luu
mo hoi » mo phoi, mo hoc, co hoi
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ly) or (sach y)) nang mo hoi. hieu va ((cac luu) OR (cac luat)) van thanh de cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ly) OR (sach y)) nang mo hoi. hieu va ((cac luu) OR (cac luat)) van thanh de cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ly) or (sach y)) nang mo hoi. hieu va ((cac luu) OR (cac luat)) van thanh de cua triet".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ly) or (sach y)) nang mo hoi. hieu va ((cac luu) OR (cac luat)) van thanh de cua triet*.