Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thien van » thi van
qua ban » cua ban
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
ha hoi » hoa hoi, ha noi, va hoi
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: thuoc sach y lang ((ha hoi) or (xa hoi)). thien van nam ((qua ban) OR (qua quan)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y lang ((ha hoi) OR (xa hoi)). thien van nam ((qua ban) OR (qua quan)) hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y lang ((ha hoi) or (xa hoi)). thien van nam ((qua ban) OR (qua quan)) hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y lang ((ha hoi) or (xa hoi)). thien van nam ((qua ban) OR (qua quan)) hanh di cua tre*.