Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
cham sac » cham soc, pham sach, cap sac
van cham » van chat, van tham, va cham
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
sac van » cac van, san van, sat van
hanh di » hanh vi, hanh de, hang di
nang xa » nang x, nang ma, mang xa
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((nang xa) or (lang xa)) hoi. hieu van cham sac van hanh di ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu van cham sac van hanh di ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (lang xa)) hoi. hieu van cham sac van hanh di ((cua triet) or (cua viet))*.