Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
hanh ca » hanh cac, hanh cat, hanh cua
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, nam duoc
ca cua » co cua
so sac » so sach, so dac
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky ((nang xa) or (tang ma)) hoi. hieu ve ((cam duc) OR (pham duc)) van hanh ca cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky ((nang xa) OR (tang ma)) hoi. hieu ve ((cam duc) OR (pham duc)) van hanh ca cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky ((nang xa) or (tang ma)) hoi. hieu ve ((cam duc) OR (pham duc)) van hanh ca cua triet".
• Adding a wildcard symbol may retrieve word variants: so sac ky ((nang xa) or (tang ma)) hoi. hieu ve ((cam duc) OR (pham duc)) van hanh ca cua triet*.