Perhaps you should try some spelling variations:
hanh kien » danh kien, anh kien, thanh vien
vu sach » vu bach, su sach, vu khach
sach vu » sach va, sach tu, sach uu
vu nang » vuc nang, va nang, vu dang
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va
xuc van » duc van, luc van, xuc ban
vuc van » duc van, luc van, thuc van
kien su » nien su, tien su, vien sau
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach vu nang ma hoi. ((hieu va) OR (hieu qua)) cam ((xuc van) or (vuc van)) hanh kien su kien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach vu nang ma hoi. ((hieu va) OR (hieu qua)) cam ((xuc van) OR (vuc van)) hanh kien su kien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach vu nang ma hoi. ((hieu va) OR (hieu qua)) cam ((xuc van) or (vuc van)) hanh kien su kien".
• Adding a wildcard symbol may retrieve word variants: vu sach vu nang ma hoi. ((hieu va) OR (hieu qua)) cam ((xuc van) or (vuc van)) hanh kien su kien*.