Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
cach bao » cach nao, sach bao, cach giao
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, vu khach
cac bao » cac bai, cac ban, cac bac
ve canh » van canh, ve thanh
canh va » canh van, hanh va, anh va
su sach » so sach
va cua » va chua, via cua, ca cua

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) or (vu sach)) ky nang xa hoi. hieu vien ((cac bao) OR (cach bao)) ve canh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang xa hoi. hieu vien ((cac bao) OR (cach bao)) ve canh va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky nang xa hoi. hieu vien ((cac bao) OR (cach bao)) ve canh va cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang xa hoi. hieu vien ((cac bao) OR (cach bao)) ve canh va cua triet*.