Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tam thuc » tham thuc, am thuc, nam thuc
va triet » va thiet, va trien, ve triet
ly nang » ky nang, ly hang, ly vang
cao hoi » cau hoi, co hoi, cao hoc
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
y nang » ky nang, v nang, may nang
va tam » van tam, va tham, va tac
vi va » vi van, vai va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((y nang) or (ly nang)) cao hoi. lieu va tam thuc va hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y nang) OR (ly nang)) cao hoi. lieu va tam thuc va hanh vi va triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ((y nang) or (ly nang)) cao hoi. lieu va tam thuc va hanh vi va triet*.