Perhaps you should try some spelling variations:
ban lanh » ban hanh, ban linh, ban anh
hieu van » hieu va, thien van, lieu va
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
hoi cua » hoi chuc
su xac » pu xac, su cac
su sac » su sach, su cac

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

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