Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
chat cua » nhat cua, chat va, chat huu
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cao hoc » co hoc, cho hoc, chat hoc
cao hoi » cau hoi, co hoi, tao hoi
cac xuc » cam xuc, cac nuoc, chat xuc
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ((cao hoi) OR (cao hoc)). hieu va cac xuc ((va hanh) or (va thanh)) chat cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((cao hoi) OR (cao hoc)). hieu va cac xuc ((va hanh) OR (va thanh)) chat cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((cao hoi) OR (cao hoc)). hieu va cac xuc ((va hanh) or (va thanh)) chat cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((cao hoi) OR (cao hoc)). hieu va cac xuc ((va hanh) or (va thanh)) chat cua viet*.