Perhaps you should try some spelling variations:
cay thuoc » cua thuoc, nam thuoc, va thuoc
thu sach » tu sach, thuat sach, thuoc sach
thu lang » thu bang, phu lang, tho lang
thu hang » thi hang, thuc hanh, thu huong
sai cua » dai cua, hai cua, lai cua
dau sai » dau hai, dau tai, danh sai
cua tre » cua te, cuu tre, cua triet
va dau » va dao

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