Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh tri » thanh tri, hanh tai, hanh trinh
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
truc va » thuc va, thuc vat, trung va
y nang » ky nang, ly nang, v nang
tri su » tri du, tai su, trinh su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang xa hoi. hieu van cac ((duc va) or (truc va)) hanh tri su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu van cac ((duc va) OR (truc va)) hanh tri su triet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu van cac ((duc va) or (truc va)) hanh tri su triet*.