Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
van hanh » van thanh, ban hanh, van ban
vien cac » vien bach, vien dai, vien da
sach ky » sac ky, sach y, sach ty
cac xuc » cam xuc, cac nuoc, chat xuc
van anh » van thanh, tuan anh, van minh
lai cua » dai cua, hai cua, lai chau
tu sach » thu sach, su sach, te sach
ma hoi » mai hoi, ma hoa, me hoi

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 ky nang ((ma hoi) or (xa hoi)). hieu vien cac xuc ((van hanh) OR (van anh)) lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (xa hoi)). hieu vien cac xuc ((van hanh) OR (van anh)) lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) or (xa hoi)). hieu vien cac xuc ((van hanh) OR (van anh)) lai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) or (xa hoi)). hieu vien cac xuc ((van hanh) OR (van anh)) lai cua triet*.