Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
hieu van » thien van, lieu va, hieu ve
danh vai » danh sai, danh va, doanh van
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
cau duc » cao duc, cau luc, chu duc
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
lo lang » o lang, so lang, le lang
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: ((su sach) or (nuoc sach)) lo lang xa hoi. ((hieu van) or (hieu va)) cau duc va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (nuoc sach)) lo lang xa hoi. ((hieu van) OR (hieu va)) cau duc va danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (nuoc sach)) lo lang xa hoi. ((hieu van) or (hieu va)) cau duc va danh vai cua tre*.