Perhaps you should try some spelling variations:
sach ty » sach tu, sach thu, xach tay
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cam thu » nam thu, cac thu, ca thu
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, ma hoa, me hoi
va cam » va cham, va cac, va cao
thu va » thuc va, thue va, tu 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: te ((sach ty) or (sach y)) nang ((ma hoi) OR (xa hoi)). hieu va cam thu va hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) nang ((ma hoi) OR (xa hoi)). hieu va cam thu va hanh di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach y)) nang ((ma hoi) OR (xa hoi)). hieu va cam thu va hanh di cuu tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach y)) nang ((ma hoi) OR (xa hoi)). hieu va cam thu va hanh di cuu tre*.