Perhaps you should try some spelling variations:
dat tren » dat trong, dua tren
sach thu » sach thue, sach thieu, sach tham
thu xang » thu hang, thu bang, thu dang
dau tren » dau tien, dau tieng, dau trong
danh dau » lanh dao, hang dau, danh tu
va danh » va dinh, va dan, va hanh
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 dau ((dau tren) OR (dat 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 dau ((dau tren) OR (dat 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 dau ((dau tren) OR (dat tren))".
• Adding a wildcard symbol may retrieve word variants: te sach thu xang xa hoi. hieu ((va cam) or (va cao)) tu va danh dau ((dau tren) OR (dat tren))*.