Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
tinh vai » tinh va, tinh hai, tinh bai
sach ky » sac ky, sach y, sach ty
cuu ban » cuu van, cua ban, cuu san
tu sach » thu sach, su sach, te sach
cuc ban » cua ban, cac ban, duc ban
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
ve cam » ve cham, ve cac, va cam
cua te » cua tu

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 dang xa hoi. hieu ve cam ((cuc ban) OR (cuu ban)) tinh vai ((cua te) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. hieu ve cam ((cuc ban) OR (cuu ban)) tinh vai ((cua te) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xa hoi. hieu ve cam ((cuc ban) OR (cuu ban)) tinh vai ((cua te) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. hieu ve cam ((cuc ban) OR (cuu ban)) tinh vai ((cua te) or (va triet))*.