Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cua triet » cua viet, su triet, va triet
hanh han » hanh nhan, hanh phan, hanh san
tu sach » thu sach, su sach, te sach
ly hang » ly quang
hieu ve » hieu va, hieu van
ve tham » va tham, ve cham, vi tham
tai ha » thai ha, tai hai, tai nha
han vi » hanh vi, han vui, hang vi
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 (vu quang)) tai ha. hieu ve tham thuc hanh han vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly hang) OR (vu quang)) tai ha. hieu ve tham thuc hanh han vi cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly hang) or (vu quang)) tai ha. hieu ve tham thuc hanh han vi cua triet*.