Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
hanh hanh » hanh han, xanh hanh, nhanh thanh
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
ly hang » ly quang
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
tai ha » thai ha, tai hai, tai nha
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 va tham thuc hanh hanh 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 va tham thuc hanh hanh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly hang) or (vu quang)) tai ha. hieu va tham thuc hanh hanh vi cua triet*.