Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cap nuoc » dat nuoc
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
hieu ve » hieu va, hieu van
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang
ve cap » ve cac, le cap, ve cai

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 ((y nang) OR (ky nang)) ma hoa. hieu ve cap nuoc ((van hanh) or (ban hanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((y nang) OR (ky nang)) ma hoa. hieu ve cap nuoc ((van hanh) OR (ban hanh)) tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((y nang) OR (ky nang)) ma hoa. hieu ve cap nuoc ((van hanh) or (ban hanh)) tai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((y nang) OR (ky nang)) ma hoa. hieu ve cap nuoc ((van hanh) or (ban hanh)) tai cua tre*.