Perhaps you should try some spelling variations:
cay phoi » tay hoi, cay cho, gap phoi
cap phoi » cap cho
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
vi cua » vai cua, di cua
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cac) or (su sach)) ky dang ((cay phoi) OR (cap phoi)). hieu va cac luc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (su sach)) ky dang ((cay phoi) OR (cap phoi)). hieu va cac luc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cac) or (su sach)) ky dang ((cay phoi) OR (cap phoi)). hieu va cac luc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (su sach)) ky dang ((cay phoi) OR (cap phoi)). hieu va cac luc va hanh vi cua tre*.