Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
dinh vai » dinh van, dinh vi, dinh va
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, su sach, vu khach
cac bao » cach bao, cac bai, cac bac
cac ban » cac dan, cac van, can ban
va dinh » van dinh, va kinh, va tinh
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (vu sach)) ky nang xa hoi. hieu vien ((cac bao) OR (cac ban)) va dinh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky nang xa hoi. hieu vien ((cac bao) OR (cac ban)) va dinh vai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu sach)) ky nang xa hoi. hieu vien ((cac bao) OR (cac ban)) va dinh vai cua triet*".