Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
sach ty » sach y, sach tu, xach tay
hieu ha » hieu hoa, hieu va, hieu ca
nam qua » nam quan, nam cua, nam mua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
qua va » quan va, qua van, vua va
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) OR (sach thu)) nang x hoi. hieu ha nam qua va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach thu)) nang x hoi. hieu ha nam qua va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach thu)) nang x hoi. hieu ha nam qua va hanh vi cua tre*.