Perhaps you should try some spelling variations:
trong van » trong cac
su triet » su viet, su tien, ve triet
ban hanh » ban hang
van hac » van hoc, van ha, van hai
hanh di » hanh vi, hanh de, hang di
cap ban » cap bang, can ban, cac ban
thu sac » thu sach, thu san, thu xac
nang xa » nang x, lang xa, nang ma
van cac » van cau, van bac, dan cac
sac ky » cac ky, sai ky
di su » doi su, ki su, da su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky ((nang xa) or (trong van)) hoi. hieu ((van cac) OR (van hac)) cap ban hanh di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky ((nang xa) OR (trong van)) hoi. hieu ((van cac) OR (van hac)) cap ban hanh di su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky ((nang xa) or (trong van)) hoi. hieu ((van cac) OR (van hac)) cap ban hanh di su triet".
• Adding a wildcard symbol may retrieve word variants: thu sac ky ((nang xa) or (trong van)) hoi. hieu ((van cac) OR (van hac)) cap ban hanh di su triet*.