Perhaps you should try some spelling variations:
nam thuc » nam thuoc, nam thu, nam tu
so sach » so sanh, bo sach, co sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di 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 cac) or (so sach)) ky lang xa hoi. lieu va ((nam thuc) or (am thuc)) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (so sach)) ky lang xa hoi. lieu va ((nam thuc) OR (am thuc)) va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (so sach)) ky lang xa hoi. lieu va ((nam thuc) or (am thuc)) va hanh vi cua tre*.