Perhaps you should try some spelling variations:
sang tao » hang tai
dung sai » dung tai, dung va, dung dat
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
hieu he » hieu ve, hiem he, hieu le
thu xay » thau xay, thuc xay, tu xay
he nam » ha nam, nghe nam
sai va » mai va, dai va, hai va

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 tao) or (tang ma)) hoi. hieu he nam thu xay dung sai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((sang tao) OR (tang ma)) hoi. hieu he nam thu xay dung sai va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((sang tao) or (tang ma)) hoi. hieu he nam thu xay dung sai va triet*.