Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thieu nang » thien nang, thieu khang, thieu quang
nham thuc » nhan thuc, nam thuc, nham thu
cua triet » cua viet, su triet, va triet
cham tuc » pham thuc, tham thuc, cham soc
hanh tai » thanh tai, hang tai, han tai
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, ban hanh
tai cua » thai cua, tai cuc, tri cua
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach thieu nang ma hoi. hieu ve ((cham tuc) or (nham thuc)) va hanh tai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach thieu nang ma hoi. hieu ve ((cham tuc) OR (nham thuc)) va hanh tai cua triet.
• Adding a wildcard symbol may retrieve word variants: thuoc sach thieu nang ma hoi. hieu ve ((cham tuc) or (nham thuc)) va hanh tai cua triet*.