Perhaps you should try some spelling variations:
sach tham » sach nha
tham lang » nham nang, pham hang, thai bang
tham thuc » nham thuc, pham thuc, tam thuc
cua triet » cua viet, su triet, va triet
lang tai » lang thai, hang tai, tang tai
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
tai hai » thi hai, dai hai, tai ha
hieu ve » hieu va, hieu van
ve tham » va tham, ve cham, vi tham
va hanh » va thanh, va danh, ban hanh
vai cua » dai cua, hai cua, lai 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 tham lang tai hai. hieu ve tham thuc ((va hanh) or (van hanh)) vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tham lang tai hai. hieu ve tham thuc ((va hanh) OR (van hanh)) vai cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach tham lang tai hai. hieu ve tham thuc ((va hanh) or (van hanh)) vai cua triet*.