Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
cap nuoc » dat nuoc
va doanh » van doanh, vay doanh, va danh
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, dua tren
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 van ((cua tre) OR (cua triet))~.
• 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 van ((cua tre) OR (cua triet)).
• 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 van ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach o lang xa hoi. hieu ve ((cap nuoc) or (hoc nuoc)) va doanh van ((cua tre) OR (cua triet))*.