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 xay » thau xay, thuc xay, tu xay
hieu he » hieu ve, hiem he, hieu le
tu sach » thu sach, te sach, tu cach
sang ma » nang ma, sang tao, mang may
su sach » so sach, vu sach
tang ma » mang may, tang van
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) OR (su sach)) ky ((sang ma) or (tang ma)) hoi. hieu he nam thu xay dung sai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky ((sang ma) OR (tang ma)) hoi. hieu he nam thu xay dung sai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky ((sang ma) or (tang ma)) hoi. hieu he nam thu xay dung sai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky ((sang ma) or (tang ma)) hoi. hieu he nam thu xay dung sai cua triet*.