Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
va thanh » gia thanh, ban thanh, va tinh
hai cau » hai chau, hai chu, hai hau
va hanh » van hanh, va danh, ban hanh
hieu va » lieu va, hieu qua
su sach » vu sach
so sach » so sanh, bo sach, co sach
cac xuc » cam xuc, cac nuoc, chat xuc
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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) or (so sach)) ky nang o hoi. hieu va cac xuc ((va hanh) OR (va thanh)) hai cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang o hoi. hieu va cac xuc ((va hanh) OR (va thanh)) hai cau theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky nang o hoi. hieu va cac xuc ((va hanh) OR (va thanh)) hai cau theo".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky nang o hoi. hieu va cac xuc ((va hanh) OR (va thanh)) hai cau theo*.