Perhaps you should try some spelling variations:
lam truoc » lam thuoc, nam truoc, lam truong
va triet » va thiet, va trien, ve triet
cam truc » cau truc, nam truc, nam truoc
minh de » menh de, minh ve, sinh de
hoi hoi » hoi hoc, hoc hoi, hoi doi
hieu ve » hieu va, hieu van
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky
ho hoi » hoc hoi, hoa hoi, co hoi
de va » de van, te va, ke va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky nang ((ho hoi) OR (hoi hoi)). hieu ve ((cam truc) OR (lam truoc)) van minh de va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky nang ((ho hoi) or (hoi hoi)). hieu ve ((cam truc) OR (lam truoc)) van minh de va triet~".
• Adding a wildcard symbol may retrieve word variants: su xac ky nang ((ho hoi) or (hoi hoi)). hieu ve ((cam truc) OR (lam truoc)) van minh de va triet*.