Perhaps you should try some spelling variations:
nguoi sach » nguoi san, nuoc sach
doc sach » hoc sach, toc sach, nuoc sach
danh vai » danh sai, danh va, doanh van
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
lang xa » dang xay, lang van
lang ha » long ha
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc sach) or (nguoi sach)) ky ((lang xa) or (lang ha)) hoi. hieu va cam xuc va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (nguoi sach)) ky ((lang xa) OR (lang ha)) hoi. hieu va cam xuc va danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (nguoi sach)) ky ((lang xa) or (lang ha)) hoi. hieu va cam xuc va danh vai cua tre*.