Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
sach thu » sach thue, sach thieu, sach tham
thu xang » thu hang, thu bang, thu dang
canh dan » canh van, sanh dan, thanh dan
danh dan » danh dau, dang dan, sanh dan
te sach » toc sach
xang xa » lang xa, mang xa, ang xa
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao

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