Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ban hanh » ban hang
te sach » toc sach
cam thu » cac thu, ca thu, cam phu
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
y lang » o lang, _ lang, tay lang
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: ((te sach) or (thuoc sach)) y lang xa hoi. hieu ve ((cam thu) OR (nam thu)) ban hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuoc sach)) y lang xa hoi. hieu ve ((cam thu) OR (nam thu)) ban hanh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuoc sach)) y lang xa hoi. hieu ve ((cam thu) OR (nam thu)) ban hanh di cua tre*".