Perhaps you should try some spelling variations:
te sach » toc sach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
hieu va » lieu va, hieu qua
luc van » luoc van, luu van, luc va
duc van » duc tan, duc manh, duc phan
hanh ve » hanh vi, hanh va, hanh kem
su tien » su kien, su hien, tu tieng
va dao » ca dao
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: te sach vu nang x hoi. hieu va dao ((luc van) or (((duc van) OR (duc va)))) hanh ve su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach vu nang x hoi. hieu va dao ((luc van) OR (((duc van) OR (duc va)))) hanh ve su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach vu nang x hoi. hieu va dao ((luc van) or (((duc van) OR (duc va)))) hanh ve su tien".
• Adding a wildcard symbol may retrieve word variants: te sach vu nang x hoi. hieu va dao ((luc van) or (((duc van) OR (duc va)))) hanh ve su tien*.