Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
lang van » dang van, tang van, hoang van
dinh dai » dinh dat, sinh dai, dinh dao
va dinh » van dinh, va kinh, va tinh
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay
va cau » van cau, va cac, va dau

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