Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va doanh » van doanh, vay doanh, hoa doanh
cap nuoc » dat nuoc
van cua » vang cua, ban cua, dan cua
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang

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