Perhaps you should try some spelling variations:
tinh hai » tinh thai, tinh chat, trinh han
duc ban » duc tan, duc van, dua ban
hai cua » thai cua, dai cua, hoi cua
cuu ban » cuu van, cua ban, cuu san
sach ky » sac ky, sach ty, sach kem
hieu va » lieu va, hieu qua
danh xa » danh ca, dinh xa, canh xa
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) OR (sach y)) danh xa hoi. hieu va cac ((duc ban) or (cuu ban)) tinh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) danh xa hoi. hieu va cac ((duc ban) OR (cuu ban)) tinh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach y)) danh xa hoi. hieu va cac ((duc ban) or (cuu ban)) tinh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach y)) danh xa hoi. hieu va cac ((duc ban) or (cuu ban)) tinh hai cua tre*.