Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cac nuoc » cap nuoc, dat nuoc, cua nuoc
danh vai » danh sai, danh va, doanh van
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang

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 xa hoi. hieu ve ((cac nuoc) or (hoc nuoc)) va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y lang xa hoi. hieu ve ((cac nuoc) OR (hoc nuoc)) va danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach y lang xa hoi. hieu ve ((cac nuoc) or (hoc nuoc)) va danh vai cua tre*.