Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
nang xa » nang x, lang xa, nang ma
luc van » luoc van, luu van, duc van
hanh ve » hanh vi, hanh va, hanh kem
su tien » su kien, su hien, tu tieng
va cao » va co, va dao, 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 nang xa hoi. hieu ((va cao) OR (va cac)) luc van hanh ve su tien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach vu nang xa hoi. hieu ((va cao) OR (va cac)) luc van hanh ve su tien".
• Adding a wildcard symbol may retrieve word variants: te sach vu nang xa hoi. hieu ((va cao) OR (va cac)) luc van hanh ve su tien*.