Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
cua triet » cua viet, su triet, va triet
ly quang » le quang, vu quang
vat hanh » vat thanh, van hanh, va hanh
tu sach » thu sach, su sach, te sach
tai hai » thi hai, dai hai, tai ha
hieu su » hieu sau, tieu su, hieu so
su cham » su pham, tu cham, vu cham
vi cua » vai cua, di cua

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 ((ly hang) or (ly quang)) tai hai. hieu su cham thuc vat hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly hang) OR (ly quang)) tai hai. hieu su cham thuc vat hanh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly hang) or (ly quang)) tai hai. hieu su cham thuc vat hanh vi cua triet*.