Perhaps you should try some spelling variations:
sach tham » sach nha
sach thu » sach thue, sach thieu, cach thuc
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, xach tay
lang ha » long ha
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ty) or (((sach thu) OR (sach tham)))) lang ha hoi. hieu va cam tuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (((sach thu) OR (sach tham)))) lang ha hoi. hieu va cam tuc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) or (((sach thu) OR (sach tham)))) lang ha hoi. hieu va cam tuc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) or (((sach thu) OR (sach tham)))) lang ha hoi. hieu va cam tuc va hanh vi cua tre*.