Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh hai » thanh hai, nhanh hai, hang hai
sach ky » sac ky, sach y, sach ty
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
cau tuc » cau truc, cau tu, cau luc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
tuc va » thuc va, truc va, tuc xa

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. ((hieu ve) or (hieu va)) cau tuc va hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (lang xa)) hoi. ((hieu ve) OR (hieu va)) cau tuc va hanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) OR (lang xa)) hoi. ((hieu ve) or (hieu va)) cau tuc va hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) OR (lang xa)) hoi. ((hieu ve) or (hieu va)) cau tuc va hanh hai cua tre*.