Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
ve nam » he nam, va nam, le nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (toc sach)) ky nang xa hoi. hieu ve nam thuc va hanh vai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (toc sach)) ky nang xa hoi. hieu ve nam thuc va hanh vai ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (toc sach)) ky nang xa hoi. hieu ve nam thuc va hanh vai ((cua tre) OR (cuu tre))*".