Perhaps you should try some spelling variations:
xanh hanh » danh thanh, ban hanh, van hanh
thu sach » tu sach, thuat sach, thuoc sach
lieu van » lieu va, hieu van, sieu van
van phan » van phong, van thanh, luan phan
phan duc » pham duc, phan tu, phan dau
anh hanh » anh thanh, anh anh, anh danh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
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: thu sach ky ((nang xa) or (lang xa)) hoi. lieu van phan duc ((anh hanh) OR (xanh hanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (lang xa)) hoi. lieu van phan duc ((anh hanh) OR (xanh hanh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) or (lang xa)) hoi. lieu van phan duc ((anh hanh) OR (xanh hanh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) or (lang xa)) hoi. lieu van phan duc ((anh hanh) OR (xanh hanh)) dai cua tre*.