Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
cam tuc » cam xuc, cam tu, dam thuc
minh de » menh de, minh ve, sinh de
hoi hoi » hoi hoc, hoc hoi, hoi doi
hieu ve » hieu va, hieu van
de cua » le cua, te cua, dieu cua
su bac » xu bac, du bac, su cac
bac ky » cac ky, ban ky, sac ky
ho hoi » hoc hoi, hoa hoi, co hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su bac ky nang ((ho hoi) or (hoi hoi)). hieu ve ((cam tuc) OR (nam thuc)) van minh de cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su bac ky nang ((ho hoi) OR (hoi hoi)). hieu ve ((cam tuc) OR (nam thuc)) van minh de cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su bac ky nang ((ho hoi) or (hoi hoi)). hieu ve ((cam tuc) OR (nam thuc)) van minh de cua triet*".