Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
danh sai » dung sai, danh bat, danh dau
xe danh » le danh, te danh, xe dan
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
ve nam » he nam, va nam, le nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((sang ma) or (mang may)) hoi. hieu ve nam thu xe danh sai ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((sang ma) OR (mang may)) hoi. hieu ve nam thu xe danh sai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((sang ma) or (mang may)) hoi. hieu ve nam thu xe danh sai ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((sang ma) or (mang may)) hoi. hieu ve nam thu xe danh sai ((cua triet) OR (va triet))*.