Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, hieu ve
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua

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 ty xang xa hoi. ((hieu van) or (lieu va)) cai dat va hanh di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty xang xa hoi. ((hieu van) OR (lieu va)) cai dat va hanh di cua vat.
• Adding a wildcard symbol may retrieve word variants: thu sach ty xang xa hoi. ((hieu van) or (lieu va)) cai dat va hanh di cua vat*.