Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
thu sach » tu sach, thuat sach, thuoc sach
cao duc » dao duc, giao duc, tao duoc
cao suc » cao su
hanh va » hang va, hanh vi
y nang » ly nang, v nang, may nang
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((y nang) or (ky nang)) x ho. hieu qua ((cao duc) OR (cao suc)) ban hanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y nang) OR (ky nang)) x ho. hieu qua ((cao duc) OR (cao suc)) ban hanh va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y nang) or (ky nang)) x ho. hieu qua ((cao duc) OR (cao suc)) ban hanh va cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((y nang) or (ky nang)) x ho. hieu qua ((cao duc) OR (cao suc)) ban hanh va cua triet*.