Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
sach ty » sach y, sach tu, xach tay
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
lam loc » lam duoc, lam ngoc
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
cuu tre » cua tre, cau tren, cau treo
ma hoi » xa hoi, ma hoa, me hoi
va lam » van lam, va lap
loc va » hoc va, luc va
di cuu » di cau, di cua, dinh cuu

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 ((ma hoi) or (mai hoi)). hieu va lam loc va hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) nang ((ma hoi) OR (mai hoi)). hieu va lam loc va hanh di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach thu)) nang ((ma hoi) or (mai hoi)). hieu va lam loc va hanh di cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach thu)) nang ((ma hoi) or (mai hoi)). hieu va lam loc va hanh di cuu tre*.