Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
danh lai » danh sai, gianh lai, dinh lam
lai cua » dai cua, hai cua, lai chau
va danh » va dinh, va dan, va hanh
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
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 (thuoc sach)) ky nang ma hoi. ((hieu van) OR (thien van)) chao xu va danh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuoc sach)) ky nang ma hoi. ((hieu van) OR (thien van)) chao xu va danh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thuoc sach)) ky nang ma hoi. ((hieu van) OR (thien van)) chao xu va danh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuoc sach)) ky nang ma hoi. ((hieu van) OR (thien van)) chao xu va danh lai cua tre*.