Perhaps you should try some spelling variations:
chua duoc » chua nuoc, cua duoc, chuan quoc
danh vai » danh sai, danh va, doanh van
hieu van » thien van, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
duoc va » nuoc va, duc va, duoc ma
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
so lang » o lang, so dang, hoa lang
lo lang » o lang, le lang, hoa lang

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 ((lo lang) OR (so lang)) xa hoi. ((hieu van) or (hieu va)) chua duoc va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((lo lang) OR (so lang)) xa hoi. ((hieu van) OR (hieu va)) chua duoc va danh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((lo lang) OR (so lang)) xa hoi. ((hieu van) or (hieu va)) chua duoc va danh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((lo lang) OR (so lang)) xa hoi. ((hieu van) or (hieu va)) chua duoc va danh vai cua tre*.