Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, pham thuc
toc sach » hoc sach, doc sach, thuoc sach
nham thu » nam thu, pham thu, nhan thuc
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu 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: ((su sach) or (toc sach)) ky nang xa hoi. hieu ve ((nham thuc) OR (nham thu)) va hanh vi cua 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 ((nham thuc) OR (nham thu)) va hanh vi cua 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 ((nham thuc) OR (nham thu)) va hanh vi cua tre*".