Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
thanh lap » thanh san, phan lap, thanh hai
vien cac » vien bach, vien dai, vien da
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
ma hoi » mai hoi, ma hoa, me hoi
lap su » lap du, lap tu, lai su

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) OR (duc van)) thanh lap su 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) OR (duc van)) thanh lap su 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) OR (duc van)) thanh lap su triet*".