Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
xuc van » duc van, luc van, vuc van
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: su sach tu 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: su sach tu nang x hoi. hieu ((va cao) OR (va cac)) xuc van ban ve su tien.
• Adding a wildcard symbol may retrieve word variants: su sach tu nang x hoi. hieu ((va cao) or (va cac)) xuc van ban ve su tien*.