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

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 van hanh ca ((cua triet) OR (cua viet))~.
• 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 van hanh ca ((cua triet) OR (cua viet)).
• 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 van hanh ca ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: so sac ky ((nang xa) or (tang ma)) hoi. hieu ve cam duc van hanh ca ((cua triet) OR (cua viet))*.