Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh doi » trinh doc, trinh do, tinh hoc
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
xay hoi » xa hoi, tay hoi, cay phoi
thuc va » thuc vat, thuc dan, thuc day
va tinh » may tinh
doi cua » dai cua, hoi cua
ve nam » le nam, te nam, viet nam
sach o » sach lo, sac o, sach y
he nam » ha nam, nghe nam
o dang » xo dang, do dang, so dang
va nam » van nam, ha nam, va nay

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach o dang xay hoi. hieu ((((ve nam) or (va nam))) or (he nam)) thuc va tinh doi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach o dang xay hoi. hieu ((((ve nam) OR (va nam))) OR (he nam)) thuc va tinh doi cua triet.
• Adding a wildcard symbol may retrieve word variants: toc sach o dang xay hoi. hieu ((((ve nam) or (va nam))) or (he nam)) thuc va tinh doi cua triet*.