Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
tu cach » tu cac
su sach » so sach, vu sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
va nam » van nam, ha nam, va nay
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 cach) or (su sach)) ky ((nang xa) OR (lang xa)) hoi. lieu va nam thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ky ((nang xa) OR (lang xa)) hoi. lieu va nam thuc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (su sach)) ky ((nang xa) OR (lang xa)) hoi. lieu va nam thuc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ky ((nang xa) OR (lang xa)) hoi. lieu va nam thuc va hanh vi cua tre*.