Perhaps you should try some spelling variations:
cua viet » hoa viet, cua vat, cua dieu
danh sai » dung sai, danh bat, danh dau
xac danh » xac dinh, tac danh, sach danh
tu sach » thu sach, su sach, te sach
thu xac » thau xay
ca viet » va viet, co viet, hoa viet
hieu he » hieu ve, hiem he, hieu le
ky dang » ky nang, ky danh
ky sang » ky nang, ky tang, duy sang
ma hoi » mai hoi, xa hoi, ma hoa
he nam » ha nam, nghe 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) OR (ky dang)) ma hoi. hieu he nam thu xac danh sai ((cua viet) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky sang) OR (ky dang)) ma hoi. hieu he nam thu xac danh sai ((cua viet) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky sang) OR (ky dang)) ma hoi. hieu he nam thu xac danh sai ((cua viet) or (ca viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky sang) OR (ky dang)) ma hoi. hieu he nam thu xac danh sai ((cua viet) or (ca viet))*.