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