Perhaps you should try some spelling variations:
dang xay » dang van, van xay
thu sach » tu sach, thuat sach, thuoc sach
danh vai » danh sai, danh va, doanh van
sach ky » sac ky, sach y, sach ty
lang ha » long ha
cac dat » cac dan, cai dat, cac dai
va danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
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: thu sach ky ((lang ha) or (dang xay)) hoi. lieu va cac dat va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((lang ha) OR (dang xay)) hoi. lieu va cac dat va danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((lang ha) or (dang xay)) hoi. lieu va cac dat va danh vai cua tre*.