Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tham thuc » nham thuc, pham thuc, tam thuc
cua triet » cua viet, su triet, va triet
phan tai » pham tai, nhan tai, phan thi
tu sach » thu sach, su sach, te sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va tham » van tham, va cham, va thanh
thuc va » thuc vat, thuc dan, thuc day
va phan » van phan, va phat, va phap
tai cua » thai cua, tai cuc, tri 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) or (thuoc sach)) ky lang xa hoi. lieu va tham thuc va phan tai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky lang xa hoi. lieu va tham thuc va phan tai cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky lang xa hoi. lieu va tham thuc va phan tai cua triet*.