Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
ky dang » ky nang, ky danh
tay hoi » tao hoi, tay thai
va hanh » van hanh, va thanh, va danh
cac luc » cau luc, coc luc, cac nuoc
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
tay ho » tay co, tay o, tay khao

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 ((tay hoi) OR (tay ho)). hieu cua 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 ((tay hoi) OR (tay ho)). hieu cua 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 ((tay hoi) OR (tay ho)). hieu cua cac luc va hanh vi cua tre*".