Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
danh sai » dung sai, danh bat, danh dau
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ha danh » han danh, hoa danh, ha anh
ma hoi » mai hoi, xa hoi, ma hoa
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 nang ((ma hoi) or (loi noi)). hieu ve nam thu ha danh sai ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (loi noi)). hieu ve nam thu ha danh sai ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) or (loi noi)). hieu ve nam thu ha danh sai ((cua triet) or (su triet))*.