Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
danh lai » danh sai, gianh lai, dinh lam
van chao » van chat, van hao, van cho
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
lai cua » dai cua, hai cua, lai chau
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, ma hoa, me hoi
xu va » xu van, tu va, su va

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 (thu sach)) ky sang ((ma hoi) OR (xa hoi)). hieu van chao xu va danh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) ky sang ((ma hoi) OR (xa hoi)). hieu van chao xu va danh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thu sach)) ky sang ((ma hoi) OR (xa hoi)). hieu van chao xu va danh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) ky sang ((ma hoi) OR (xa hoi)). hieu van chao xu va danh lai cua tre*.