Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
hieu vien » hieu hien, hieu viec, thieu nien
va triet » va thiet, va trien, ve triet
vien cac » vien bach, vien dai, vien da
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
cac loc » cac lop, cac toc, cac hoc
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
loc va » hoc va, luc va
su sac » su sach, su cac, su xac

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

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