Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
sach vuc » sach duoc, sach nuoc, sach truc
vuc nang » cuc nang, vu nang, chuc nang
anh kien » danh kien, hanh kien, anh kiem
kien su » nien su, tien su, vien sau
van anh » van thanh, tuan anh, van minh
xuc van » duc van, luc van, vuc van
tu sach » thu sach, su sach, te sach
va cao » va cac, va co, va dao
va cai » va cac, va bai, va dai

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 vuc nang ((xa hoi) or (ma hoa)). hieu ((va cai) or (va cao)) xuc van anh kien su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vuc nang ((xa hoi) OR (ma hoa)). hieu ((va cai) OR (va cao)) xuc van anh kien su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach vuc nang ((xa hoi) or (ma hoa)). hieu ((va cai) or (va cao)) xuc van anh kien su triet*.