Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
ban hanh » ban hang
sach thu » sach thieu, sach tham, cach thuc
hanh va » hang va, hanh vi
duc ban » duc tan, duc van, dua ban
cau tre » cau tren, cau treo, cau tra
nang xa » nang x, lang xa, nang ma
va cau » van cau, va dau, va cao
va cam » va cham, va cao, va cai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach thue) or (sach thu)) nang xa hoi. lieu ((va cam) OR (va cac)) duc ban hanh va cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach thue) OR (sach thu)) nang xa hoi. lieu ((va cam) OR (va cac)) duc ban hanh va cau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach thue) or (sach thu)) nang xa hoi. lieu ((va cam) OR (va cac)) duc ban hanh va cau tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach thue) or (sach thu)) nang xa hoi. lieu ((va cam) OR (va cac)) duc ban hanh va cau tre*.