Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
hang cua » mang cua, hang ca, huong cua
hanh cua » manh cua, hanh sua, doanh cua
cac luc » cau luc, coc luc, cac nuoc
van cac » van hac, van cau, van bac
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
so sac » so sach, so dac

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 (nang ma)) hoi. hieu van cac luc va ((hanh cua) or (hang cua)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky ((nang xa) OR (nang ma)) hoi. hieu van cac luc va ((hanh cua) OR (hang cua)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky ((nang xa) OR (nang ma)) hoi. hieu van cac luc va ((hanh cua) or (hang cua)) cua triet".
• Adding a wildcard symbol may retrieve word variants: so sac ky ((nang xa) OR (nang ma)) hoi. hieu van cac luc va ((hanh cua) or (hang cua)) cua triet*.