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

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 o ((lang xa) OR (lang van)) hoi. hieu ve ((cap nuoc) or (hoc nuoc)) va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach o ((lang xa) OR (lang van)) hoi. hieu ve ((cap nuoc) OR (hoc nuoc)) va danh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach o ((lang xa) OR (lang van)) hoi. hieu ve ((cap nuoc) or (hoc nuoc)) va danh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach o ((lang xa) OR (lang van)) hoi. hieu ve ((cap nuoc) or (hoc nuoc)) va danh vai cua tre*.