Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
noi khoa » ngoai khoa, hoc khoa, tai khoa
cac thuc » cach thuc, cac thu, can thuc
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
luu tre » luu tru, cuu tre, luy tre
noi hoc » hoi hoc, voi hoc, loai hoc
ly nang » ky nang, ly hang, ly vang
y nang » ky nang, v nang, may 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) or (ly nang)) ((noi hoc) OR (noi khoa)). hieu va cac thuc va hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y nang) OR (ly nang)) ((noi hoc) OR (noi khoa)). hieu va cac thuc va hanh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y nang) or (ly nang)) ((noi hoc) OR (noi khoa)). hieu va cac thuc va hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((y nang) or (ly nang)) ((noi hoc) OR (noi khoa)). hieu va cac thuc va hanh vi luu tre*.