Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
xuc van » duc van, luc van, vuc van
sach tu » cach tu, sach ty, sach uu
su tien » su kien, su hien, tu tieng
va cao » va co, va dao, va bao
ban ve » ban va
x hoi » xa hoi, o hoi, x ho
ve su » va su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach tu) OR (sach thu)) nang x hoi. hieu ((va cao) or (va cac)) xuc van ban ve su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (sach thu)) nang x hoi. hieu ((va cao) OR (va cac)) xuc van ban ve su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) OR (sach thu)) nang x hoi. hieu ((va cao) or (va cac)) xuc van ban ve su tien".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) OR (sach thu)) nang x hoi. hieu ((va cao) or (va cac)) xuc van ban ve su tien*.