Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
hanh tri » thanh tri, hanh tai, hanh trinh
truc va » thuc va, thuc vat, trung va
so sach » so sanh, co sach, hoc sach
nang xa » nang x, lang xa, nang ma
bo sach » co sach, hoc sach
van cac » van hac, van cau, van bac
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: ((so sach) OR (bo 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: ((so sach) OR (bo sach)) y nang xa hoi. hieu van cac ((duc va) OR (truc va)) hanh tri su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (bo 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: ((so sach) OR (bo sach)) y nang xa hoi. hieu van cac ((duc va) or (truc va)) hanh tri su triet*.