Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
trang xa » trang va, trang ha, trong xa
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
tang xa » tang ma, lang xa, tang ha
duc ban » duc van, dua ban, duc man
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
hieu v » hieu va, hieu ve, hieu 2
v pham » vi pham, d pham

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 ky ((tang xa) or (trang xa)) hoi. hieu v pham ((duc ban) OR (duc tan)) thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((tang xa) OR (trang xa)) hoi. hieu v pham ((duc ban) OR (duc tan)) thanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((tang xa) or (trang xa)) hoi. hieu v pham ((duc ban) OR (duc tan)) thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((tang xa) or (trang xa)) hoi. hieu v pham ((duc ban) OR (duc tan)) thanh hai cua tre*.