Perhaps you should try some spelling variations:
sach tham » sach nha
dau tren » dau tien, dat tren, dau tieng
sach thu » sach thue, sach thieu, cach thuc
danh da » danh dau, dan da, danh ca
va danh » va dinh, va dan, va hanh
xang xa » lang xa, mang xa, ang xa
va cam » va cham, va cao, va cai
da dau » dan dau, dat dau, va dau

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 thu) OR (sach tham)) xang xa hoi. hieu ((va cam) or (va cac)) tu va danh da dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thu) OR (sach tham)) xang xa hoi. hieu ((va cam) OR (va cac)) tu va danh da dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach thu) OR (sach tham)) xang xa hoi. hieu ((va cam) or (va cac)) tu va danh da dau tren".
• Adding a wildcard symbol may retrieve word variants: te ((sach thu) OR (sach tham)) xang xa hoi. hieu ((va cam) or (va cac)) tu va danh da dau tren*.