Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cac thuc » cach thuc, cac thu, cay thuc
can thuc » dan thuc, van thuc, cay thuc
noi khoa » ngoai khoa, hoc khoa, tai khoa
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
noi hoc » hoi hoc, voi hoc, loai hoc
luu tre » luu tru, cuu tre, luy tre
y nang » ky nang, ly nang, v nang
vi luu » vi lua

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 ((noi hoc) or (noi khoa)). hieu ve ((cac thuc) OR (can thuc)) va hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((noi hoc) OR (noi khoa)). hieu ve ((cac thuc) OR (can thuc)) va hanh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang ((noi hoc) or (noi khoa)). hieu ve ((cac thuc) OR (can thuc)) va hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((noi hoc) or (noi khoa)). hieu ve ((cac thuc) OR (can thuc)) va hanh vi luu tre*.