Perhaps you should try some spelling variations:
dien sach » dien anh
hieu dien » lieu dien, bieu dien, hieu hien
sach nuoc » sach duoc, cac nuoc, bach tuoc
xanh doi » xanh di, thanh doi, tinh doi
vu sach » su sach, vu khach
nang ma » tang ma, sang ma, mang may
va xanh » va danh, va hanh, va anh
doi cua » dai cua, hoi cua
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: ((vu sach) OR (vu bach)) ky ((nang ma) or (nang cao)) hoi. hieu dien sach nuoc va xanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu bach)) ky ((nang ma) OR (nang cao)) hoi. hieu dien sach nuoc va xanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu bach)) ky ((nang ma) or (nang cao)) hoi. hieu dien sach nuoc va xanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu bach)) ky ((nang ma) or (nang cao)) hoi. hieu dien sach nuoc va xanh doi cua tre*.