Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cua dang » cua cong, cua ban
cay phoi » cap phoi, tay hoi, cay cho
te sach » toc sach
hanh ve » hanh vi, hanh va, hanh kem
xuc van » duc van, luc van, vuc van
su hien » su kien, su tien, thu hien
vu dang » su dang, vu quang
va dao » ca dao
va cao » va cac, va co, va bao
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: te sach ((vu dang) OR (cua dang)) cay phoi. hieu ((va cao) or (va dao)) xuc van hanh ve su hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((vu dang) OR (cua dang)) cay phoi. hieu ((va cao) OR (va dao)) xuc van hanh ve su hien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((vu dang) OR (cua dang)) cay phoi. hieu ((va cao) or (va dao)) xuc van hanh ve su hien".
• Adding a wildcard symbol may retrieve word variants: te sach ((vu dang) OR (cua dang)) cay phoi. hieu ((va cao) or (va dao)) xuc van hanh ve su hien*.