Perhaps you should try some spelling variations:
chua triet » cua triet, chua thiet, chua trieu
ban hanh » ban hang
vien cac » vien bach, vien dai, vien da
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cuc ban » cua ban, cac ban, cuu ban
hanh va » hang va, hanh vi
va chua » vua chua, ca chua, va chu
ve cac » va cac
x hoi » xa hoi, o hoi, 5 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 ((x hoi) or (x ho)). hieu ((ve cac) OR (vien cac)) cuc ban hanh va chua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((x hoi) OR (x ho)). hieu ((ve cac) OR (vien cac)) cuc ban hanh va chua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((x hoi) or (x ho)). hieu ((ve cac) OR (vien cac)) cuc ban hanh va chua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((x hoi) or (x ho)). hieu ((ve cac) OR (vien cac)) cuc ban hanh va chua triet*.